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Thread: 3'' spintech exhaust or 2 1/2 '' ?

  1. 01-20-2004, 02:32 PM #1
    CobraVnmn
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    3'' spintech exhaust or 2 1/2 '' ?

    i got a 331 with 185 afr heads, tfs track heat intake, v2-sq trim, bbk long tube headers, crower cam plus other goodies..

    I need to know what you guys think about my exhaust and what would work best for my application... I have the stock pulley so its good for about 8-10 psi with the power pipe.. Should i run 3'' dr.gas x pipe to a 2 1/2 cat back.. or should i run 3'' all the out ?? Or 2 1/2 all the way out?

    With the 331 and the 185 afr heads i dont think my low end will be hurting that bad.. I got a crower cam with these specs .527/.544 112 lobe, thats with 1.7 r.r ... I had that cam on my 302 and my low end was hurting bad !! but i figure with more cubes that should help it out drastically..

    What do you guys think about this set up that i have? think i should run the 3'' or the 2 1/2 " ? Appreciate any imput, thanks guys !!
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  2. 01-20-2004, 06:58 PM #2
    s-trimmed302
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    I have a similar combo, but I only have 302 cubic Inches and my car REALLY picked up when I went to a 3" system and X Pipe.Im thinking the motor picked up an easy 5-10rwhp by going with the 3" system but I have not Dynod since so I cannot be certain about the #s..I will tell you that some people will recommend you using the 2.5" system, but My combo really picked up when I went from 2.5 to my 3" system.

    BTW, I have AFR 185s, S-Trim with 10-11 psi..
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  3. 01-21-2004, 01:36 PM #3
    CobraVnmn
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    what size injectors are you running? what type of cam do you got?
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  4. 01-21-2004, 07:37 PM #4
    s-trimmed302
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    I run 42# injectors, and a Lunati 51014 cam.Im now in the process of swapping cams to a FTI / Ed Curtis cam.Should see even more Power under the curve, with this Custom cam..

    Jeff
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  5. 01-22-2004, 12:16 PM #5
    CobraVnmn
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    your combo sounds nice, do you have a sound clip?
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  6. 01-22-2004, 03:32 PM #6
    s-trimmed302
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    No sorry I dont have a sound clip..I would give anything If I knew how to take a soundclip of my car and upload it to the internet..Hopefully my new FTI cam will sound as good as my old Lunati cam..

    Jeff
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  7. 01-23-2004, 02:47 PM #7
    CobraVnmn
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    would you guys say that w/ bkk long tube a 3" dr.gas x ( off road ) & a 3" spintech cat back is super loud?

    compared to bbk shorties, flowtech x pipe ( off road ) & 2 1/2 two chamber flows?
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