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any gain in hp.

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    any gain in hp.

    want to know would a EX CB7 muffler on 2.25 piping and stock cat make a gain in hp.

    #2
    the exhaust system is only as free flowing as the smallest bottleneck. the 2.25" piping with the narrow stock muffler will possibly cause you to actually lose power due to increased turbulence in the system. it's possible that you'll gain power somewhere, but unlikely. if you go with bigger piping get a bigger muffler. if you want a stock muffler your better off with stock piping.

    do some research on the rsx type s exhaust system. thats a popular oem muffler that people use for some performance gains. if the rsx exhaust system is wider than ours then you can go that size and it'll probably work well.

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      #3
      thanks man for the reply,was thinking about doing this,just didn't want it to loud.didn't want to loose any hp to.

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        #4
        if you want quiet performance look into the apexi world sport 2. its a great system. not the cheapest but not unreasonable. great quality and sound. not loud at all. it tends to hang really low though so if you want to slam your car and still expect to crawl over speed bumps and driveways you might have an issue! thats my only beef with it. the sound and performance are amazing.

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          #5
          ok,i'll check into it.

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            #6
            Originally posted by Jonas View Post
            the exhaust system is only as free flowing as the smallest bottleneck. the 2.25" piping with the narrow stock muffler will possibly cause you to actually lose power due to increased turbulence in the system. it's possible that you'll gain power somewhere, but unlikely. if you go with bigger piping get a bigger muffler. if you want a stock muffler your better off with stock piping.

            do some research on the rsx type s exhaust system. thats a popular oem muffler that people use for some performance gains. if the rsx exhaust system is wider than ours then you can go that size and it'll probably work well.
            Actually, it's not quite as restricted as the smallest bottleneck. If you have a 1 inch pipe all the way back (for example) it's more restrictive than a two inch pipe with a 1 inch bottleneck somewhere along the line, but (obviously) more restrictive than say a 2 inch opening all the way back. But, ideally, if you go with bigger pipe you would want to go with a bigger muffler. The less restriction and turbulence, the better, up to a point. You can lose low end power with too large a pipe.

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              #7
              a 2" pipe with a 1" bottleneck will see lots of turbulence. youll get greater exhaust velocity from smaller piping of a consistent size than a larger pipe with a bottleneck.

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                #8
                Originally posted by Jonas View Post
                a 2" pipe with a 1" bottleneck will see lots of turbulence. youll get greater exhaust velocity from smaller piping of a consistent size than a larger pipe with a bottleneck.
                Iwas picturing a smooth, tapering reduction in my mind as opposed to an abrupt pinch, I guess. Less turbulence that way. You're right on the velocity though, I wasn't even thinking about that.

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