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Honda Civic SR4/SR3 EG9/EG6 B16A MUGEN Cat-back Exhaust System 1st Generation

Posted on Wednesday, May 16th, 2012 at 11:32 am

This is the rarest item that I get from my ‘runner’, Mugen cat-back exhaust eystem 1st generation for my car, 2.25″ piping, JASMA tag, s-flow type muffler for street perfomance in very good condition!

Let exhaust exit freely will increase the power, isn’t true? There is something that need to consider too, like, back pressure, upgrade or you will downgrade your exhaust system, but I believe at Mugen R&D department.

Exhaust piping diameter is a crucial part in the exhaust system. For those with 1600cc engines and below, stick with anything less than 2.0″ except if you had extensive jobs on the engine such as higher compression pistons or performance camshaft upgrades. For stock VTEC or MIVEC 1600cc and above, around 2.0″ to 2.25″ is acceptable. Some people even use 2.5″ on stock VTEC but the result is poor at lower rpm because the exhaust gas have less velocity to travel. Apart from the diameter, the piping route is also important. Straight pipes are not really advisable for street because they tend to get in the way when you’re running on a road bump. It is annoying and you will get scratches on the bottom of the pipe, or worse bent pipes. Piping that follows the original route is the best. While it gives you stock appearance, many people claim that it gives better low end to midrange power compare to straight piping. While weak at low end, straight piping somehow tend to give better acceleration power because exhaust gas gets out easily because of the shorter pipe compare to stock. Source :

Made from only the highest grade polished 304 stainless steel!

From Mugen catalog,

This is my old system, 2.0″ piping, time to say goodbye…

Catalyst converter deleted (de-cat)! Catalyst converters are the biggest restriction to the exhaust gas flow. Removing it will definitely release some more power, but it is bad for environment.

My new system, fits! what the beautiful bend!

Muffler is more to cosmetic rather than performance. There is minimal difference in power output if we compare straight-thru type muffler (also known as N1 type) with s-flow type muffler (which usually have big resonator box). The later is seemed to be more preferable for street usage because more silent, thus giving more pleasant driving experience especially while in cruising mode. Personally, I would recommend Tanabe s-flow like the G-Medallion series because they are very silent when idling and cruising. This avoids attention from the authority. If you are going for N1 type, make sure it is made of good quality. Avoid imitations, they are widely sold by Wei Yip (tidak tipu customer) at surprisingly cheap price. Good exhaust doesn’t come cheap but they are worth it. Try to spend some time to go to ‘kedai potong’ and try look for used branded exhaust. They are worth it. Other than that, exhaust with JASMA tag (not JASMA brand) should be good enough for street. From my experience and observations, JASMA approved exhaust tend to be quiet, unless the used mufflers are already running out of fiber. If your setup is still noisy, it is advisable to install a resonator (bullet silencer) in the middle. Source :

Even I didn’t do dyno test, but I could feel, the sound and the power, gentle sound at the low RPM (1-4K), sporty sound without being too loud or raspy at the high RPM (5-7K), silent but deadly! overall sound is just amazing though.

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