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Exhaust Question

Discussion in 'Engine Building' started by Luded, Jan 23, 2006.

  1. Luded

    Luded Member

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    Okay. Im planning on buying the apexi gt spec exhaust for my car (92 prelude vtec) it has 3.74" piping is this good or bad? My build is either going to be turbo or all motor havnt decided yet. Never though to big of piping could be bad but read yall talking in other post. what do yall recommend?
     
  2. 94accordex

    94accordex Member

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    I suggest that you decide between naturally aspirated/boosted before you spend any money on a new exhaust because certain piping sizes are not ideal for one or the other. 3.74" seems like it would be way too big for naturally aspirated.
     
  3. Luded

    Luded Member

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    would 3.74" be good for turbo? and what do you think woudl be ideal with NA?
     
  4. 92CHB

    92CHB Senior Member

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    3.74" is pretty damn big. For turbo setup i wouldn't go larger than 3" unless you are running a huge turbo. As for NA thats just waaaaaaaay to big, you more like 2.25"-2.5"
     
  5. Luded

    Luded Member

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    hmm i really wanted to get the apexi kit. time to go back to the thinking board
     
  6. MikeBergy

    MikeBergy Blah blah blah....

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    Are you sure that it doesn't just have a 3.74" outlet? Many systems have a large outlet (i.e. fart-cannons), but still have a smaller diameter piping. I don't see you being able to buy an aftermarket bolt on exhaust with piping that large, unless its made for a turbo diesel truck or something. Check the specs again. I am pretty sure you misread something.

    Just read on the apex'i website....the 3.74 inch piping diamter is only for certain apps. Here is the application site. Apex'i GT Exhaust Applications 60mm piping for all prelude apps. That's 2.36 inches, much more appropriate. Probably a little too small for turbo applications, but good for most all motor. Are those the super loud ones? I'd look into the world sport if you plan on encountering any disgruntled police.
     
  7. E_SolSi

    E_SolSi Member of the 20 nut club Moderator VIP

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    straight from Apexi 's site
    http://www.apexi-usa.com/product_exhaust_d...d=181&pageNum=1

    so thats 60mm piping with a 115mm tip

    60 millimeter = 2.362 204 724 inch
    115 millimeter = 4.527 559 055 inch

    i have no idea where you got 3.75 inches from [​IMG]
    but those are the specs for that exhaust
    perfectly fine for NA too small for turbo
     
  8. MikeBergy

    MikeBergy Blah blah blah....

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    I posted too slow, you beat me, E.
     
  9. E_SolSi

    E_SolSi Member of the 20 nut club Moderator VIP

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  10. Luded

    Luded Member

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    what size piping should i need if i choose to go with the turbo route?

    this is where i got the 3.74"


    "The GT System is a FULLY polished stainless steel exhaust utilizing a massive 95mm* (3.74 inches) piping diameter channeled through a 114.3mm (4.5 inch) tip." copied from the apxi website

    but i see where it says the prelude diameter. I didnt read enuf of it lol [​IMG]
     
  11. E_SolSi

    E_SolSi Member of the 20 nut club Moderator VIP

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    for turbo you pretty much want 3"

    and yeah i read the little blurb after i posted and saw that.... looks like its only available on a few specific models
     
  12. MikeBergy

    MikeBergy Blah blah blah....

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    Yeah, 3 inch piping is pretty much the norm unless you are going with a HUGE turbo, in which case you would know more about this stuff than me. Going custom will probably be best in that situation.
     
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