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400 hp

This is a discussion on 400 hp within the General Help forums, part of the LSx Technical Help Section category; I want 400 hp! The mods i want to do would be headers, ls6 intake, ls6 heads ported, and possibly ...

  1. #1
    Pony_eater Pony_Eater's Avatar
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    2000 trans am ws6

    400 hp

    I want 400 hp! The mods i want to do would be headers, ls6 intake, ls6 heads ported, and possibly true duals. My current mods are PP MAF and TB, SLP lid, cat back, smooth bellows. How close would I be to 400hp? Are ebay headers a bad choice? should I go 1 3/4 or 1 7/8? Keep in mind all the mods need to be very streetable cuz this is my dd

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    NY Representative basballny2's Avatar
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    2001 ws6

    RWHP or crank hp? if you plan 400+ RWHP go with 1 7/8 and id stay away from the ebay headers

  3. #3
    Senior Member karpetcm's Avatar
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    01 Camaro 6speed

    If your talking crank, with LT's, ory or catted, SLP lid, exhuast and tune you should be about 340 RWHP. If you count a few other small mods, like UD pulley, TB bypass, 160 Thermo, Smooth Bellow and exuast cut out could pick up a few more. To the wheels would be way different and require a cam or cam and head work.
    1993 Z28 M6: K&N Intake, 52mm TB, TB Bypass, No Cats, Exhaust Cutout, Flowmaster Muffler, 3.90 Gears, 160 Thermo, Tune, BMR Springs, Bilstein Shocks, 3 Point SFC,s & MGW Shifter.

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    Veteran 0rion's Avatar
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    06 duramax

    I would do these ebay headers in a heart beat ( read the 8th post down) here.
    You're most likely not very close with your current mods. Without heads it would take a pretty nice size cam to net you 400 to the wheels. With heads you could probably get it with a 224.

  5. #5
    Pony_eater Pony_Eater's Avatar
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    i want the HP at the wheels. I know im not close with the mods i have but will having ls6 heads with ls7 lifters and ls2 trays with the heads ported and headers get me close? like 385 ish?

  6. #6
    Member blownh2x's Avatar
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    99 Firehawk (M6) #518

    I purchased stainless steel headers off of Ebay for $180. They bolted up with no problems or issues, but I did buy different gaskets than they supplied to be safe. Worked for me and the car sounds great

  7. #7
    Member tav8ws6's Avatar
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    Sunset Orange Metallic-M6
    2002 Pontiac Trans Am WS6

    i was told 1-7/8 isnt necessary and (I THINK) the kentucky speed guys have 1-3/4 on their 638 rwhp car. you dont want to lose the torque from no back pressure

  8. #8
    NY Representative basballny2's Avatar
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    ^ When i was tlaking to Mark from KY speed he told me he had 1 7/8. (if i remember correctly)

  9. #9
    Member tav8ws6's Avatar
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    Sunset Orange Metallic-M6
    2002 Pontiac Trans Am WS6

    Heres what he said...not to be confrontational, or maybe he confused himself, happens to everyone.


    Originally Posted by tav8ws6
    would 400 rwhp need 7/8? or would 3/4 suffice?


    i am running 642 rwhp and doing it on 1 3/4 headers..

    thanks, mark

  10. #10
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    pewter
    2002 Tans am WS6 M6

    I think for you 1 3/4 will be just fine. 1 7/8 is for the extream ends. The way I look at things with car parts is buy it right the first time and be done with it "within reason". to hit 400 wheels your going to need a cam. There is a thread posted Guess My HP and he has about the same setup with nubers posted now.

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    pewter
    2002 Tans am WS6 M6


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