Product test: retrofit silencer for Kawasaki Z 750

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Product test: retrofit silencer for Kawasaki Z 750
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Product test: retrofit silencer for Kawasaki Z 750

Product test including videos about the exhaust systems
Retrofit silencer for Kawasaki Z 750

Anyone can do it lighter and louder. But what about the performance? Ten mufflers for the Z 750 compete against the original.

Jorg Lohse

12/30/2010

Kawasaki Z750 exhaust test

The exhaust is still one of the most popular conversion parts on a bike. No wonder: First of all, the conversion is done extremely quickly on a moody Saturday afternoon with the Bundesliga conference in the background. Secondly, it is hardly easier and faster to give the bike a really noticeable slimming diet. And thirdly, most of the mufflers from the accessory shelves are in the sound rating far above the well-behaved and honestly downgraded series part. After a successful repotting campaign, why not think so right away? The answer to that is pretty simple.

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Product test: retrofit silencer for Kawasaki Z 750

Product test including videos about the exhaust systems
Retrofit silencer for Kawasaki Z 750

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The legal requirements for vehicle homologation leave the motorcycle manufacturers hardly any leeway – as can also be seen on the MOTORRAD test bike, a 2010 Kawasaki Z 750. A throttle valve in the exhaust tract operated by a servomotor must be adapted to the vehicle’s noise limit values.

The mufflers from the accessories trade, on the other hand, do not have such technical finesse – and often fail in the MOTORRAD series of measurements at the legally stipulated driving noise limit of 80 dB (A). Nevertheless, all test systems have an EG-BE for the Kawasaki Z 750. And according to the E-label, none of them has been issued in any exotic banana republic. According to the official documents, the test sites are located in the core states of the EU, particularly in Luxembourg. Who knows, maybe the air is a bit thicker there in the orbit of the Brussels bureaucracy…

In the video below, MOTORRAD test editor Jorg Lohse explains the special features of this exhaust test and you can see and hear the test candidates on the following pages.

Original Kawasaki exhaust


Product test: retrofit silencer for Kawasaki Z 750


mps photo studio

Weight: 6.0 kg Power: 102 PS Sound: grim

providers: Kawasaki, phone 06172/7340, www.kawasaki.de
coat: Stole
price: 1086.49 euros
Weight: 6.0 kg
Standing / driving noise in dB (A) (according to papers; measured): 96/80; 93/78
catalyst: available
variants: no

Plus:
Matches the look of the vehicle; to be installed precisely and tension-free; powerful, Kawa-typical sound; even output; Stationary and driving noises complied with

Minus:
Heavy; scratch-sensitive surfaces

Conclusion:
Why switch The original system of the Z 750 turns on by the typical smoky Kawa sound and is also good in terms of performance in the feed. The vile material mix of steel and stainless steel is expensive and heavy.

MOTORRAD verdict: good

Acrapovic Slip On (MOTORRAD test winner)


Product test: retrofit silencer for Kawasaki Z 750


mps photo studio

Weight: – 53.3% power: + 1.3% sound: bass tube

providers: Jamparts, phone 07150/970565, www.akrapovic.de
coat: Titanium
price: 827.05 euros
Weights: Connecting pipe 0.5 kg; Muffler 2.3 kg; Total 2.8 kg
Stationary / driving noise in dB (A): 91/85
catalyst: available
Country of Manufacture: Slovenia
E-mark: 1 (Germany)
variants: Carbon 827.05 euros; Stainless steel 606.90 euros

Plus:
First-class workmanship with welds from the textbook; precisely fitting and easy to assemble, exemplary assembly instructions; dull rumbling, bass-heavy sound; nice power output with homogeneous torque curve

Minus:
Driving noise level above the limit

Conclusion:
A light masterpiece made of titanium. Liked by the noble mix of materials, great finish, typical Akrapovic sound and a small plus in torque and top performance. Small deficit in the noises, there is a cat on board.

MOTORRAD verdict: very good

Arrow Race Tech


Product test: retrofit silencer for Kawasaki Z 750


mps photo studio

Weight: – 53.3% power: – 0.4% sound: bright and garish

providers: Alpha Technik, phone 08036/300720, www.alphatechnik.de
coat: Aluminum (black anodized)
price: 418 euros
Weights: Connecting pipe 0.4 kg; Muffler 2.4 kg; Total 2.8 kg
Stationary / driving noise in dB (A): 92/83
catalyst: available
Country of Manufacture: Italy
E-mark: 13 (Luxembourg)
variants: Titanium 568 euros; Alu 418 euros (prices including connecting pipe)

Plus:
Kat available; easy

Minus:
Retaining clip not fixed, rubber sleeve fitted in carelessly, overall difficult to assemble and with tension; Welding points partly not deburred; (Superfluous) retaining eyelet on the connecting tube collides with the strut redirection during assembly

Conclusion:
Arrow’s contribution to the old-school design can only shine a little when it comes to performance checks, workmanship and assembly. On the other hand, the beastly sound is still within limits in terms of noise technology, and a catalytic converter is available.

MOTORRAD verdict: Satisfactory

Devil Master


Product test: retrofit silencer for Kawasaki Z 750


mps photo studio

Weight: – 43.3% power: + 0.5% sound: mobile subwoofer

providers: Hostettler, phone 07631/18040, www.ixs.de
coat: Carbon
price: 559 euros
Weights: Connecting pipe 0.7 kg; Silencer 2.7 kg; Total 3.4 kg
Stationary / driving noise in dB (A): 92/84
catalyst: unavailable
Country of Manufacture: France
E-mark: 13 (Luxembourg)
variants: no

plus:
Powerful sound

minus:
Cumbersome pre-assembly with many parts and screws as well as poorly fitting rubber sleeve for the retaining clip; comparatively heavy, stainless steel surfaces on the connecting pipe slightly tarnished; no cat

Conclusion:
The risk of crowning the noble-looking carbon shell with a disdainful plastic cap divides the viewer. Fumbling is the order of the day when it comes to cultivation, the performance show remains subdued. But the brute sound turns it on.

MOTORRAD verdict: Satisfactory

Gianelli GX-One


Product test: retrofit silencer for Kawasaki Z 750


mps photo studio

Weight: – 64.8% power: – 7.2% sound: shrill and angry

providers: Hostettler, phone 07631/18040, www.ixs.de
coat: Stainless steel
price: 429.95 euros
Weight: 2.1 kg
Stationary / driving noise in dB (A): 96/82
catalyst: unavailable
Country of Manufacture: Italy
E-mark: 13 (Luxembourg)
variants: no

Plus:
Extremely light

Minus:
Retaining straps not exactly positioned and difficult to align with the mounts on the motorcycle, tension-free assembly not possible; Weld seams partly unkind; Power output remains below series level; no cat

Conclusion:
The unconventionally shaped Gianelli exhaust can score points on the scales, but the weight advantage disappears quickly overall. Especially when it comes to the performance check, the only imprecisely fitting muffler disappoints.

MOTORRAD verdict: Sufficient

Hashiru Sportline


Product test: retrofit silencer for Kawasaki Z 750


mps photo studio

Weight: – 50% power: – 2.0% sound: garish

providers: Polo express delivery, phone 0180/5225785, www.polo-motorrad.de
coat: Stainless steel
price: 199 euros
Weights: Connecting pipe 0.6 kg; Muffler 2.4 kg; Total 3.0 kg
Stationary / driving noise in dB (A): 94/85
catalyst: unavailable
Country of Manufacture: Italy
E-mark: 3 (Italy)
variants: “Black Cap” with black end cap from 269 euros

Plus:
Neatly processed

Minus:
The retaining clip with rubber sleeve is difficult to adjust and can only be installed with a lot of tension; Connecting tube hits the footrest; Driving noise well above the limit; no cat; poor power output with torque dent

Conclusion:
The cheapest exhaust in the test still leaves an impression in the sound rating, but it lacks in many other disciplines. The assembly turns into a fiddly test of patience, and the performance is more than poor.

MOTORRAD verdict: Sufficient

Hurric Rac 1


Product test: retrofit silencer for Kawasaki Z 750


mps photo studio

Weight: – 46.7% Power: + 1.0% Sound: Rock’n’Roll

providers: Fechter Drive, phone 07023/95230, www.fechter.de
coat: Alu
price: 269 euros
Weights: Connecting pipe 0.6 kg; Muffler 2.6 kg; Total 3.2 kg
Stationary / driving noise in dB (A): 96/85
catalyst: unavailable
Country of Manufacture: Italy
E-mark: 3 (Italy)
Variants: Carbon 369 euros

Plus:
Cleanly processed; thanks to the firmly screwed holder, it can be precisely adjusted and installed without tension; nice torque plus in the middle; powerful, masculine sound; Homologation pass in credit card format

Minus:
No cat; Driving noise over limit

Conclusion:
Inexpensive and good. The Hurric cuts a fine figure not only when it comes to assembly. The full sound and power output are also convincing. There is only a problem with compliance with the law: The catalytic converter is missing, the driving noise is very high.

MOTORRAD verdict: good

Laser X-Treme GP style


Product test: retrofit silencer for Kawasaki Z 750


mps photo studio

Weight: – 43.3% power: – 4.6% sound: sonorous and full

providers: Hostettler, phone 07631/18040, www.ixs.de
coat: Stainless steel
price: 609.95 euros
Weights: Connecting pipe 1.1 kg; Muffler 2.3 kg; Total 3.4 kg
Stationary / driving noise in dB (A): 93/82
catalyst: available
Country of Manufacture: Netherlands
E-mark: 13 (Luxembourg)
variants: no

plus:
Cleanly and nicely processed; Kat included; practical homologation pass in credit card format

minus:
Connection pipe dimensioned very short, only slight overlap with elbow outlet; weak power output, peak power remains well below series.

Conclusion:
The double barrel shotgun from laser Although it can score with a very individual look and extremely attractive workmanship, it disappoints on the test bench with weak values ​​and can still improve on the accuracy of fit.

MOTORRAD verdict: Sufficient

Leovince Factory Evolution II (MOTORCYCLE purchase tip)


Product test: retrofit silencer for Kawasaki Z 750


mps photo studio

Weight: – 58.3% power: + 0.8% sound: smoky

providers: MCA Service, phone 05139/894906, www.leovince.de
coat: Carbon
price: 669 euros
Weights: Connecting pipe 0.7 kg; Muffler 1.8 kg; Total 2.5 kg
Stationary / driving noise in dB (A): 93/84
catalyst: available
Country of Manufacture: Italy
E.–Certification mark: 13 (Luxembourg)
variants: Titan 669 euros

plus:
Great finish; precisely fitting, easy and tension-free to assemble; nice power output with considerable torque increase in the middle range; Kat included; Nice sound with deep, slightly smoky bass

minus:
Sensitive carbon surfaces

Conclusion:
The beautifully crafted exhaust in compact shortgun style impresses not only with its weight and sound. The cat-equipped Leovince also impresses on the test bench with a full punch in the medium speed range.

MOTORRAD verdict: very good

Leovince GP Pro Evolution II


Product test: retrofit silencer for Kawasaki Z 750


mps photo studio

Weight: – 61.7% power: + 0.7% sound: robust and blatant

providers: MCA Service, phone 05139/894906, www.leovince.de
coat: Stainless steel
price: 479 euros
Weights: Connecting pipe 0.4 kg; Muffler 1.9 kg; Total 2.3 kg
Stationary / driving noise in dB (A): 97/88
catalyst: unavailable
Country of Manufacture: Italy
E-mark: 9 (Spain)
variants: with Kat 549 euros

Plus:
Great finish with first-class processed surfaces; to fit precisely and tension-free; inimitable sound experience

Minus:
Unspectacular performance; no cat; Driving noise levels far above the limit

Conclusion:
Brute and beastly: The sound of the GP Pro makes your heart flicker and gives you goose bumps – and makes the trip with the Z 750 to the rock festival for the senses. With the noise levels and the performance curve, however, disillusionment is announced.

MOTORRAD verdict: Satisfactory

Shark Factory


Product test: retrofit silencer for Kawasaki Z 750


mps photo studio

Weight: – 61.7% power: – 0.5% sound: full and powerful

providers: Fechter Drive, phone 07023/95230, www.fechter.de
coat: Carbon
price: 539 euros
Weight: 2.3 kg
Stationary / driving noise in dB (A): 98/87
catalyst: available
Country of Manufacture: Italy
E-mark: 3 (Italy)
variants: no

Plus:
Clean design with an attractive surface finish; quick and tension-free assembly thanks to precise alignment; Kat included; Homologation pass in practical credit card format

Minus:
Driving noise levels far above the limit

Conclusion:
Extremely slim shaped bag that can serve up a lot in terms of sound and also shines extremely brightly at the finish. On the other hand, the dent in the torque curve and the decibel peaks in the driving noise are disappointing.

MOTORRAD verdict: Satisfactory

Final scoring


Product test: retrofit silencer for Kawasaki Z 750


Drawing: archive

The final score of the exhaust test.

Successful tuning is also a question of the wallet in this test. For the two very good systems from Akrapovic and Leovince, you have to leaf through a number of notes on the counter, but the equivalent value fits. The mix of materials, workmanship and accuracy of fit are right, plus the (small, but existing) performance plus and the catalytic converter that a Euro 3 motorcycle should have even after repotting. Unfortunately, this is missing in the hurricane system, which otherwise showed a coherent picture. With all the others, light and shadow alternate.

This is how MOTORRAD tests


Product test: retrofit silencer for Kawasaki Z 750


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Left on the roll: the performance show put to the test.

Of course, the points belong “Performance ”and “Volume ”is one of the central elements in the MOTORRAD exhaust test. What the Z 750 with the retrofit silencers does in terms of kilowatts and newton meters was determined on the in-house test stand of the editorial team. We went to the MOTORRAD top test area to measure the stationary and driving noises.


Product test: retrofit silencer for Kawasaki Z 750


jkuenstle.de

Rolling away at 50 km / h: noise measurement on the top test area.

Important for the legally relevant driving noise value: the motorcycle rolls up to the test section in second and third gear at 50 km / h and is fully accelerated by an abrupt gas pull. The passages are recorded from the left and right. The decibel value printed here is made up of the average of eight drives past minus two dB (A) tolerance. If it was exceeded – which were the order of the day in this test – there was a corresponding point deduction. Further test criteria: What is the quality of workmanship, where is the problem with fit and assembly.

A disaster


Product test: retrofit silencer for Kawasaki Z 750


jkuenstle.de

Can also go in the pants: a test bench run with a defective cat.

A look at this exhaust test shows how united Europe actually is. For example, all tested systems have an EC approval, recognizable by the E number stamped on the muffler (see photos on the far right). This should actually be enough to use the accessory on public roads. Just not in Germany. Because motorcycles that are registered after 2006 must meet Euro 3. Consequently, explains Thomas Schuster from the expert monitoring organization KuS (www.kues.de), “motorcycles with replacement silencers must also meet the standard and be equipped with a catalytic converter “.


Product test: retrofit silencer for Kawasaki Z 750


Drawing: archive

This is what the power delivery looks like with a defective Kat-cartridge.

Even if you pass the emissions test at the main inspection with a cateless system, it is not permitted to use it. Because, so Schuster explains, “Only exhaust gas limit values ​​are checked at the HU. The Euro 3 itself consists of an extensive test cycle that such a system would hardly pass ”. Should a system with a cat really eat up its power (see graphic), this indicates a defective cat cartridge. Conversely, the most powerful systems in this test were also the cleanest.

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