headers-40hp or myth?

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Mar 6, 2004 | 12:31 PM

SteveDoten

Thread Starter

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From: Farmington CT

Cruise-In VII Veteran

headers-40hp or myth?

do headers really produce 40 horse on a stock ls1 or is it marketing hype? i'm talkin about full length from lg, kooks, stainless, etc., the shorties are just a waste of time and $

Mar 6, 2004 | 12:32 PM

Greg00Coupe

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Joined: Aug 1999

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From: Bluffton SC via Canton Oh

Re: headers-40hp or myth? (connecticut)

Article in CF a few months back saying 35 ish.

Mar 6, 2004 | 12:32 PM

CraZee ZO6

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From: St. james NY

Re: headers-40hp or myth? (connecticut)

yeah people are picking up 25-35rwhp!

Tune does help though. :cheers:

Mar 6, 2004 | 12:35 PM

pewter99

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Re: headers-40hp or myth? (connecticut)

see sig

same day I dynoed a stock 99MN6 did 296RWHP..so I gained 32~

can't wait to see after my cam this week because the day I dynoed it was raining like a beotch and I am sure the humidity didnt help

[Modified by pewter99, 12:35 PM 3/6/2004]

Mar 6, 2004 | 12:47 PM

SteveDoten

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From: Farmington CT

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Re: headers-40hp or myth? (connecticut)

alright, which ones to buy lg, kooks, stainless? :steering:

Mar 6, 2004 | 12:49 PM

pewter99

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Re: headers-40hp or myth? (connecticut)

Depends on your wallet...I have the TPIS...lots of folks say the LG's are the best ...FLP's are bolt on ( no welding) but cost more...

Mar 6, 2004 | 02:10 PM

Terry Burger

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From: Simi Valley CA

Re: headers-40hp or myth? (connecticut)

Lots of guys get only 10rwhp too, but I think the LG headers are the best I've seen out there.

Mar 6, 2004 | 02:21 PM

Z06ufgrad2002

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From: Melbourne FL

Re: headers-40hp or myth? (connecticut)

I'd say a more reasonable expectation would be 25 hp gain and with a tune maybe 30 hp gain.

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Mar 6, 2004 | 02:47 PM

joe03z06

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Re: headers-40hp or myth? (Z06ufgrad2002)

28 here with flp's

Mar 6, 2004 | 02:51 PM

#10

C7GrandSport

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From: Rockville Centre NY

Re: headers-40hp or myth? (connecticut)

40 HP might be a bit unrealistic for headers alone on a car that started out properly tuned. Expect 20-25 HP and you won't be disappointed.

Mar 6, 2004 | 02:54 PM

#11

Rays Vet

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From: Va, Beach VA

Re: headers-40hp or myth? (pewter99)

I just bought kook's but I am looking for only 30hp tuned but I will force my self to accept 40 plus(sotp) :lol:

Mar 6, 2004 | 03:07 PM

#12

Oyishdog

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From: Charlotte NC

Re: headers-40hp or myth? (connecticut)

Seems like most people have dyno'd 25-35rwhp, so yea, 40 at the crank is most likely accurate

Mar 6, 2004 | 03:26 PM

#13

mdhmi

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From: Detroit

Re: headers-40hp or myth? (connecticut)

Quote:

Do headers really produce 40 horse on a stock ls1 ..... ?

Maybe at the crank if you had an aftermarket cat-back and a good tune, but definitely not 40 rwhp with no other changes.

Mark

Mar 6, 2004 | 06:49 PM

#14

TRR

Le Mans Master

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From: Somewhere Texas

Re: headers-40hp or myth? (mdhmi)

Here's what I got on my 2002 A4 Z28

Bone Stock 281.3 RWHP
303.5 RWTQ

Kook's LT Headers
Kook's Y-Pipe
Magnaflow Cats
Corsa Cat Back Exhaust
LS1 Edit, Dyno Tuned

328.6 RWHP Plus 47.3 RWHP
345.5 RWTQ Plus 42 RWTQ

TRR

[Modified by TRR, 5:49 PM 3/6/2004]

Mar 6, 2004 | 07:59 PM

#15

Brannon

Burning Brakes

Joined: Oct 2003

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From: Farmersville Texas

Re: headers-40hp or myth? (connecticut)

I dyno'd at 339 with LG, without tune. Sorry, I don't have a base line, but 35-40 is more than possible with LG long tube.

Mar 6, 2004 | 08:28 PM

#16

1320dance

Instructor

Joined: Jan 2003

Posts: 241

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From: south boston va

Re: headers-40hp or myth? (connecticut)

my buddy 99 ss got 32 hp with lg tubes, shorties added 10 hp :seeya

Mar 6, 2004 | 08:41 PM

#17

Greg_E

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From: Middletown CT

Re: headers-40hp or myth? (connecticut)

Quote:

do headers really produce 40 horse on a stock ls1 or is it marketing hype? i'm talkin about full length from lg, kooks, stainless, etc., the shorties are just a waste of time and $

Don't expect to get those kind of gains through the stock CAT's and you will not pass emissions testing in CT without CAT's. I have LPE headers, and Ed at LPE said to expect around 15HP gain through the stock CAT's. Hi flow or none will improve those numbers.

[Modified by Greg_E, 8:45 PM 3/6/2004]