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Straight pipes on my 87 325is

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    Straight pipes on my 87 325is

    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?

    #2
    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 btw
    BEERTECH

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      #3
      Yeah i know its gonna be way louder cuz i got straight pipes on my 98 328 and it sounds good, just wanna know if it sounds good on e30s.

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        #4
        The reason i want to run straights is performence wise.

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          #5
          Do it. If it's too loud, throw a resonator in.

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            #6
            Originally posted by denisbmwm5
            The reason i want to run straights is performence wise.
            it's not going to make your car any faster...
            Build thread

            Bimmerlabs

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              #7
              not by much at least, although the placebo effect and more noise will make you think otherwise
              BEERTECH

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                #8
                I 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.

                I need to replace my cat sometime, but either high flow cat.....or would a resonator in its place work too?

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                  #9
                  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.


                  Keep it slideways!!

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                    #10
                    Originally posted by rwh11385
                    I 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 motor
                    BEERTECH

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                      #11
                      Yea i was thiking or using some sort of a high flow cat or resanator. what exactly is a rasanator? its build like a cat? or muffler? im asking jsut i never experimented on them

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                        #12
                        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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                          #13
                          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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                            #14
                            I just had pipes back to a Magna FLow muffler and it was WAY too loud, well I thoguht I wouldhave a hogh flow put on to make it quiter, it did nothing and I could fell thetop end get weaker.

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                              #15
                              Hopefully mine wont be too bad. I have S52 headers and downpipes to a AA 3" collector back to a 3" Borla stainless muffler. And I am actually taking this from advice from a few S52 boys and the price was right....

                              Free! 8)
                              Im now E30less.
                              sigpic

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