My whole exhaust is starting to comedown. the converter is rusty and the pipes by the rear control arm are squeeshed half way. I got a dtm dual inlet muffler that i just got and put on there and ill probably use it in the new exhaust. My question is how big of piping to use, and should i use a converter or not? Here in Florida we dont have emmesion tests anymore so no cat would be no problem. Do m20b25 sound good with straight pipes?
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Straight pipes on my 87 325is
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there is no reason to run without a cat on the street. None whatsoever. Modern cats are higher flowing and less expensive than ever. But a universal cat from www.jegs.com or www.summitracing.com
Your car will get really loud without a cat btwBEERTECH
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I drove my car for a day without the rear exhaust section, and I got a noise ticket ($40 CAD). Other than that it sounded wicked. At low rpm's it burbles like a race car, and at 6k rpm's it's way too loud. Can't listen to radio or anything, and I had a huge headache after an hour of driving.
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Originally posted by rwh11385I know e9nine had straight on his former car.....not sure if he posted ckips, but I had the feeling it sounded 'dirty'. It might be loud, but probably will sound like SHIT.
Well I bought his car and drove it for 8 hours, got a good idea of the exhaust sound. I liked it, with the stock muffler it wasnt too loud. Cant comment for the power changes
I do know a local guy added straight pipes to his built 2.8 stroker, got really loud, sounded good, and he says it pulls hard. but he has a balls out built motorBEERTECH
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Cat:
A catalytic converter is one of the most important parts of a car's emissions control system. It treats the exhaust before it leaves the car and removes a lot of the pollution. Learn how they work.
Basically scrubs the exhaust gasses. has the side effect of quieting the exhaust noise.
A resonator is basically a smal hig flowing muffler, usually tube shaped, whose purpose is to reduce noise.BEERTECH
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when rebuilding my car we started it with just exhuast manifold. IT SOUNDS ORGASMIC! it would sound like a true race car with just a straight pipe. Put if you put a cat back on it it might just sound raspy like something is broken, you either need to build an exhuast thats likely to be over 90dB or run a normal street exhuast.
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