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headers

This is a discussion on headers within the GTO forums, part of the Vehicle Specific category; ok im thinking about getting long tubes but im wodering do they really flow that much better than the factory ...

  1. #1
    Member
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    black, and black
    04 M6

    headers

    ok im thinking about getting long tubes but im wodering do they really flow that much better than the factory manifolds, i mean they look like a shorty header, are the long tubes worth the investment. I know they dont give the 30 advertised hp the manafacture says, how much do u guys think 10hp 20 hp??
    04 blk/blk m6, K&N fipk, slp MAF, 85mm tb/bypass, UD pully factory chrome wheels 255 rears245 fronts B&M tinted windows ws6 hood D/S rotors diablo sport slp II long tubes custom exahust no cats, no res, battery relocate cust. skid plate 160 t stat 85mm fast intake drag bags

  2. #2
    Member 05gtoautoX's Avatar
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    Impulse Blue
    2006 Pontiac G.T.O.

    I would probably say between 20-30hp, honestly I felt quite a bit of difference although I added OR mid-pipes at the same time, mine dynoed at
    348RWHP stock and 374RWHP after, all on a dyno-jet. mines also got a good custom tune and a volant CAI
    2006 impulse blue G.T.O
    Iron Block 408
    Cam
    Pacesetter ceramic coated L.T.s
    LMII exhaust
    K&N CAI
    Ported TB
    Custom Tune
    FAST 90
    ZEX 125hp wet shot

  3. #3
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    black, and black
    04 M6

    headers

    im prolly going get some pace setters because there in the budget, how hard was it on the goat?? and i would love 20 extra hp my slp diablo has teh slp tune already which has headers in it so i should be ok

  4. #4
    Member 05gtoautoX's Avatar
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    Impulse Blue
    2006 Pontiac G.T.O.

    The passenger side went really easy for me, like 45mins total, but the drivers side was a bitch, I had to drop the rack and pinion and jack up the engine, it took me like 6 hours.

  5. #5
    Junior Member
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    Quick Silver
    2004 GTO

    Yeah me too. Go Kooks you won't be sorry with there header and yeah msot deff 20-30 hp with a professional tune

  6. #6
    Mr.GTO
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    black
    2004 pontiac GTO

    Smile

    Is there any differernce between the ls1 stock exhaust manifolds and the stock ls2 exhaust manifolds as for as putting a pair of ls2 exhaust maifolds on my ls1 would it make any difference at all and would thy bolt right in ? Thanks for any input

  7. #7
    Junior Member
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    Quick Silver
    2004 GTO

    why are you messing with them? Just doing an 04 to 05 convt I assume. and no there shouldn't be a problem but i'm not 100%. If the 05-06 header will fit then why not the stock exhaust manifolds

  8. #8
    Mr.GTO
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    2004 pontiac GTO

    No i was just wondering about getting more performance out of the stock ls2 exhaust manifolds vs the stock ls1 exhaust manifolds for my ls1 04 GTO. I found a used pair of ls2 stock exhaust manifolds for sale and was wondering about hp increase or if its even worth doing. I know the JBA shortys are the same for the 04s to the 06s as far as direct bolt in so i would assume the exhaust manifolds would be as well but assumption is usally the mother of all F***ups. At least for me it is anyways lol.

  9. #9
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    Quick Silver
    2004 GTO

    I don't think it would do much other than maybe change the sound. Save up and by some LT's then you'll find true happiness

  10. #10
    Mr.GTO
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    2004 pontiac GTO

    Talking

    Yeah i know i wish the only ones i found that are legal are the jba shortys for ca. but i havent really looked into putting high flow cats after the long tubes to see if that would be legal or not for ca. I was also thinking about running the jba shorties with some electric exhaust cutouts that would sound friggin nice a little less horse than the long tubes but no need for a cat back system when youre running open exhaust. Isnt our exhaust 2 1/2 inch piping as well does anybody know?

  11. #11
    Member
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    black, and black
    04 M6

    manifolds

    for visual inspection the 04 05-06 look the same but i dont know if theres a difference, a quick way to find out for sure would be, do a search on parts america for an 04 and an 06 see if they have the same part numbers, im going long tubes some day

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