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Exhaust system.

Discussion in '3sge' started by Jester, Nov 25, 2008.

  1. Jester

    Jester Well-Known Member

    Yeah I'm still on about this twin exhaust deal, now the only thing that's stopped me from doing it already is the fear that it'll have a negative effect due to a lack of back pressure, anyway I've never taken a good look at the entire system and the end of my system actually seems extremely restrictive, there are about four 90 degree turns in it, now I'm just wondering if this is normal or if being like this is actually creating far too much back pressure and thus joining in the twin pipe will actually help a lot. so I'm asking for a few people to get down on yours hands and knees and take a good look or even better a couple pics and show me your exhaust system.

    Exhaust is clearly a subject I'm fuzzy on.
  2. mephtar

    mephtar Well-Known Member

    I have maybe 4 90's in mine total. Dont go overkill on exhaust, 2-2.25 would be ideal
  3. CrazyAchmed

    CrazyAchmed Well-Known Member Donated!

    The 90* corners will create some more added back pressure for you. I wouldn't run any pipes bigger than 2.5". Mephtars idea of 2-2.25" is probably ideal.

    Are you going to run a camaro style muffler with tips? Or get the all in one muffler/tip combo(N1 Style?)
  4. Jester

    Jester Well-Known Member

    I got 2 and quarter inch pipe atm. wanna keep that but tap in a another exhaust off the straight pipe so were it does it's first 90degree turn i want it to split into both directions if that'll work.
    can anyone see any problems with this?

    Here's a pic of what i'm trying to mean.
  5. rye

    rye Well-Known Member Donated!

    I think you'll need to keep the exhaust coming over the axle at the back where it is, and then split it into 2, splitting it before the wheels might be too tricky to get them routed to the back.
  6. Celic_GT2

    Celic_GT2 Well-Known Member Moderator Donated!

    imo, the whole back pressure thing is a bunch of crap. all back pres does is give a bit more torque cause the exhaust is so damn restricted. for example, with open headers, the car would seem to have no balls when you step on it. but the thing people dont realize is that you could rev the bitch to almost 10g and make more hp. do the numbers. you can only make an exhaust for one specific rpm. say 5000.. thats where you want full hp/boost ect that means anything above or under its loosing power and torque. the twin exhaust wont really do a whole lot. unless its tuned for a specific cause @ a specific rpm
  7. Mafix

    Mafix Owner Staff Member Administrator Donated!

    none of those systems you drew will work. you have to split the system after the axle line. you cannot cross exhaust across the fuel filler.
  8. CrazyAchmed

    CrazyAchmed Well-Known Member Donated!

    You need to look into a Camaro Style exhaust setup. You need to go over the rear suspension/axle before you can split it. The car just isn't big enough for you to split so far forward. Plus the Gas Tank and Fuel Lines will be in the way.

    The camaro style will 90 to the center of the car after the rear, and then give you the dual outlet option. I think in the import world, the CRX may have a similar setup for those cars. I want to say I've seen them before, but I don't remember.

    There is also a member on this board, Lone Wolf I believe..who did duals on his car, or a buddies. May want to look into the setup he is running.
  9. Mafix

    Mafix Owner Staff Member Administrator Donated!

    neon exhaust would be what your thinking of mike.
  10. rye

    rye Well-Known Member Donated!

    The CRX, old HB Civics, Neons, and the V6 Camaros exhaust may work.
  11. Coupes only

    Coupes only Well-Known Member

    Building exhaust. Catless monster no name muffler and no resinator (st18)
    Exhaust pipe from flex flange back gen 2 3sge how much hp is my gain its basicly straight pipe looks like the muffler doesnt muffl at all
  12. Seank90

    Seank90 Well-Known Member Donated!

    you need some back pressure
  13. Coupes only

    Coupes only Well-Known Member

    Restriction you mean , 2" pipe needs flow if anything
  14. LionTR

    LionTR Well-Known Member Donated!

    Don't do that! Car will be awfully loud and you will loose low end torque. Go 2.25 with sport catalytic converter and sport mufflers.
  15. jwagner162

    jwagner162 Well-Known Member Donated!

    mines 2.25" gen 2 header, straight through, no cat. 1 small resonator where the cat was and a magnaflow straight through muffler. its loud. sounds great but loud, was really cool for about the first week. ive been considering going with a longer resonator.

    -edit: it was actually cool until i learned that even though my car sounds like it has 9 million hp, its only putting down 126.3 at the front wheels.

    -i really think ive gotten a complex about it.
  16. LionTR

    LionTR Well-Known Member Donated!

    Yeah, I've been there too. First, when my system was completed 4 or 5 years ago, it only had a small straight through muffler and a thing that we call "gas accelerator" (that was good for nothing, but I was stupid enough to let myself fooled). At that state my ears got jammed and it banged at shifts that even I got scared, so I immediately put back the cat.

    Since that I had several middle and rear mufflers, each one made it more quiet. It's quite good now, but I'm still thinking on an more bigger rear muffler to make it more quiet. Guess I'm getting old :)
  17. Coupes only

    Coupes only Well-Known Member

    Im staying with catless 2" n straight througg muffler if i get sick of it ill throw a trd twin tip chrome i think at maby 170 hp ill be just fine keep in mind its 2nd gen 3sge w/ ram air
  18. Stig

    Stig ST162 Guru Donated!

    Just find a decent power/noise balance
    Mine's also too loud and I'm constantly changing it as I get older and the complaints
    get more frequent.
    The gen2/3 headers & no cat as we all seem to be using makes a lot more noise
    than the stock systems with cats, so it's no surpise so many of us have been caught out.

    Back pressure? - it's a myth! -based on 2 stroke motors to prevent the fuel mix from
    flowing down the pipe when the intake and exhaust ports are open -
    4 strokes need help sucking the gas to/from the cylinders and back pressure will
    have a negative effect

    "gas accelerator" I think you're referring to a cast iron thermal reactor?
    They are intended to help burn away excess fuel & improve emissions but they do
    kill power and one of the 1st things rotary owners chuck in the bin
  19. LionTR

    LionTR Well-Known Member Donated!

    I meant this:


    I had this exact same part.
  20. Stig

    Stig ST162 Guru Donated!

    It's a fancy looking "Cherry bomb" I think was the original name when they came out. Stock has a massive one between the seats

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