What gain from changing the headers and cats?
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Racer
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From: The most important unknown town in America
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What gain from changing the headers and cats?
Does anyone have the horsepower figures for what is gained by changing the headers and cats to long tube headers and high-flow cats? I already have a Blackwing and Stingers, but am wondering if headers are worth the cost.
Safety Car
Joined: Sep 2003
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From: Cape Coral FL
Re: What gain from changing the headers and cats? (MGRDY2K)
I have a stock LS1. I had my Corsa's, VaraRam, smooth airbridge coupler, and Corsa Xpipe. I dyno'ed at 316rwhp and 322rwtq. I put the headers on with the midsection, plugs and wires, and the LS6 manifold and dyno'ed at 347rwhp and 356rwtq. I started ripping those 295's in second with 3:42's. Now I have to get a tune to bring out some more hp/tq and mostly to get the engine running cleaner. Hope to pick up around 10-12hp from that.Headers were worth it, considering that if you get anything performance oriented later on, you will need headers pretty soon anyway. :thumbs:
Le Mans Master
Joined: Oct 2002
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From: dudley MA
Re: What gain from changing the headers and cats? (ArKay99)
.Headers were worth it, considering that if you get anything performance oriented later on, you will need headers pretty soon anyway. :thumbs:
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Re: What gain from changing the headers and cats? (MGRDY2K)
Same mods....see sig
same day...stock 99 dynoed 290rwhp
[Modified by pewter99, 8:45 AM 1/23/2004]
same day...stock 99 dynoed 290rwhp
[Modified by pewter99, 8:45 AM 1/23/2004]
Racer
Joined: Aug 2002
Posts: 400
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From: Fort Worth TX
Re: What gain from changing the headers and cats? (pdd000)
mods:Patriot stage II Ls6 heads,TR224/561 114lsa,dyno tuned,slp double roller timing chain,dual crane valve springs,ported ls6 oil pump,vararam induction with k&n filter,power duct,bbk 80mm throttle body, ls6 intake,flp long tube headers,high flow cats,x pipe,Z06 ti's,DTE stage II 3.90's,hardened output shaft,spec III lightweight clutch,spec aluminum flywheel,zo6 master and slave,raybestos brake pads,zinc rotors,hre547's 18's on mps 295's&265's,throttle body bypass,hotchkis sway bars&end links,taylor wires,carbon fiber door sills, blk&red(steering wheel,seat covers, shift boot,arm rest and floor mats),ken king brake boot,rear tailight loovers,steering wheel sticker,front rear corvette stickers,b&m ripper,gacs,polished aluminum shift ***,corvette winshield sticker,euro tailights,corvette third brake light sticker,white face gauges 5 color,flush tailight kit,chrome exhaust plate,red carbon engine covers, carbon intake cover, carbon wheels wells, carbon winshield washer tank, carbon coolant tank,red calipers,piaa 1100 foggers,a&a frame savers and rocker savers,neons in gills,alpine 7998,rockford fosgate 1500db,rockford rfr 10in 2000watt sub with hangover box,kicker-kx600,2-cdt es-620 comp's6.5's,2-mb quart 5 1/4 components,autobahn 1 farad cap,100sq ft of fatmat,all 0gauge wire,140amp alt,optima yellow top,rear deck protector,aci rear spoilor,lowered 1inch,clear euro tailights,autovation pedals,window valet,chrome hoops, C5R headlights,PIAA super plasma GT-X-9005-9006 bulbs,RK sport carbon fiber interior,mickey mouse co-pilot
:cheers: :smash: :lol:
Safety Car
Joined: Oct 2000
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From: Monticello MN
Re: What gain from changing the headers and cats? (MGRDY2K)
Does anyone have the horsepower figures for what is gained by changing the headers and cats to long tube headers and high-flow cats? I already have a Blackwing and Stingers, but am wondering if headers are worth the cost.
Ed
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Burning Brakes
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From: phila. pa .usa
Re: What gain from changing the headers and cats? (C5XTASY)
I put kooks headers& free flow cats on 2 weeks ago, big boost ,dont waste your money on those little hp. gains you wont feel,the headers made a big change in mine & its not tuned,I also have a vortech intake& stingers.
Team Owner
Joined: Sep 2001
Posts: 23,283
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From: Lake Elsinore, CA
Re: What gain from changing the headers and cats? (MGRDY2K)
Headers are a very worthwhile mod. And eventually you will need to do them as you strive to squeeze ever more power from the engine. Best overall bang-for-the-buck mod as a standalone, though, especially on an MN6, is gears IMO.
Team Owner
Joined: Mar 2001
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From: Virginia Beach
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Re: What gain from changing the headers and cats? (Patches)
I just good Kooks LTs and cats too. Car pulls harder for sure, but no dyno yet. After driving a malibu for a week (re-ring) it makes it hard to really feel the full difference, but I can tell it's there.
Melting Slicks
Joined: Feb 2003
Posts: 2,814
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From: FT Lewis WA
Re: What gain from changing the headers and cats? (C5 CU)
depending on which LT and high flow cats you use you can expect from 20 up to 40rwhp.
[Modified by Cary, 9:40 PM 1/23/2004]
Team Owner
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From: Swansea IL
Re: What gain from changing the headers and cats? (MGRDY2K)
I went from 292 RWHP/302 RHTQ to 324 RWHP/329 RWTQ with FLP headers/high flow cats and their x-pipe. I had a Blackwing and Corsa Indy's when I dyno'd in at 292. My AFR's were horrible dropping to 10.5:1 at 5200 RPM's.
After the headers (and no tuning) my AFR's were right at 12.5:1 from 5000 to 6000 PRM's. So the headers leaned out my car. On the other hand if I was "in tune" or lean I guess adiing the headers would have leaned me out even more and that's not good either.
So I cured my problem w/o tuning and saw a nice big gain of 32 RWHP with FLP's headers. Well worth the $1425 I paid.
Good luck
Tom
After the headers (and no tuning) my AFR's were right at 12.5:1 from 5000 to 6000 PRM's. So the headers leaned out my car. On the other hand if I was "in tune" or lean I guess adiing the headers would have leaned me out even more and that's not good either.
So I cured my problem w/o tuning and saw a nice big gain of 32 RWHP with FLP's headers. Well worth the $1425 I paid.
Good luck
Tom
Melting Slicks
Joined: Feb 2003
Posts: 2,814
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From: FT Lewis WA
Re: What gain from changing the headers and cats? (Bone_Stock)
I would recommend anybody to go with LT's but make sure you get the right kind- LG LT's
:cool:
:cool:
BTW, nice Sig PIC.
Traded my 2002 NHRA SE TransAm, M6 in for the 2001 C5 Coupe, A4 that I have now. Too bad I could not afford to have both. However, just this past week I bought a 1997 Chevy Malibu to be my daily driver. Now, my 
is a weekend warrior :lol: - Cary
Thread Starter
Racer
Joined: May 2002
Posts: 284
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From: The most important unknown town in America
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Re: What gain from changing the headers and cats? (AFVETTE)
thanks for the info. Still not sure they are worth the money. Maybe somday.
