400 Rwhp
Safety Car
Joined: Jul 2001
Posts: 4,661
Likes: 67
From: Ocean Springs MS
Originally Posted by bigred6906
Assume my Z is putting out 350 RWHP stock....catback probably doesnt add anything.....halltech 10 HP....x-pipe....10 HP....high flow cats 5 HP.....LS1/LS6 Edit computer tune....wont add 25 HP?????
Dyno it, mod it, and dyno it again, is the only way to tell if a mod added power. BTW - LT headers and tune only got me 30HP and 34TQ (before and after dyno), so I doubt you have 375RWHP now.
Last edited by fdxpilot; Sep 27, 2005 at 04:29 PM.
Racer
Joined: Aug 2005
Posts: 404
Likes: 2
From: VB Va
I have long tube headers, hi flo cats, x-pipe, borla exhaust, twin cone air intake, and looking to put a cam in my 99 coupe, I want 400 rwhp too....curious to know what it is now though.....and oh yeah, my most important mod.....the skip shifter, hahahaha.....
Safety Car
Joined: Jun 2004
Posts: 4,969
Likes: 534
From: Witness Protection Program Somewhere, USA
2026 Restomod of the Year Finalist
Originally Posted by Nat04Z06
Why in the world would headers void your warranty? I guess if you develope an exhaust leak I could see where they could be a problem. But for anything else, your warranty should be fine.
Drifting
Joined: Aug 2003
Posts: 1,751
Likes: 3
From: Ventura, CA Fight On Forever
St. Jude Donor '03-'04-'05
Headers make more of a difference with H/C.
Headers and exhaust mods only release gas from the combustion chamber faster. If the combustion stays the same, the gains from LTs are minimal. Increase the combustion with better flowing Heads and a more aggressive Cam......and the LTs can do more work.
My A4 makes 395/381 RW with AFR Heads, LGs and a pretty mild Comp Cam: 220/224-581/581-115 LSA. Stock Intake and TB. A M6 would easily be at 420 with the exact same set up. A Dirt Bag Buddy, who will reamin nameless, has about 17 hp on me after similiar mods + a FAST Intake+LS2 TB. Good Luck,
mtv
Headers and exhaust mods only release gas from the combustion chamber faster. If the combustion stays the same, the gains from LTs are minimal. Increase the combustion with better flowing Heads and a more aggressive Cam......and the LTs can do more work.
My A4 makes 395/381 RW with AFR Heads, LGs and a pretty mild Comp Cam: 220/224-581/581-115 LSA. Stock Intake and TB. A M6 would easily be at 420 with the exact same set up. A Dirt Bag Buddy, who will reamin nameless, has about 17 hp on me after similiar mods + a FAST Intake+LS2 TB. Good Luck,
mtv
Race Director
Joined: Jan 2003
Posts: 14,285
Likes: 0
From: Houston, Tx Got traction?
CI 5-6-7-8-9-10 Veteran
St. Jude Donor '07-'08
Originally Posted by bigred6906
i guess i have no choice but to add some headers.....thinking about kooks or LGs.....so with long tubes i should be close enough right...doesnt have to be exact....
I guess i'm just tryin to say LT's alone will not get you even "close enough" LT's need to work along with a few other key mods.
With LT's intake and exhaust my coupe was 342 or 328 <depending on which dyno.
Chris
Melting Slicks
Joined: Mar 2003
Posts: 2,744
Likes: 9
From: FL
Cruise-In VI Veteran
Get a cam and LT's.... a MILD cam will get you there being it's a Z with better flowing LS6 heads. I mean, they do flow better than LS1 castings but still suck..
224/228 on a 114 with LT's, all bolt ons. pulley etc.. you are there...
224/228 on a 114 with LT's, all bolt ons. pulley etc.. you are there...
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Administrator
Joined: Mar 2001
Posts: 368,389
Likes: 24,795
From: In a parallel universe. Currently own 2014 Stingray Coupe.
C7 of the Year - Modified Finalist 2021
MO Events Coordinator
St. Jude Co-Organizer
St. Jude Donor '03 thru '26
NCM Sinkhole Donor
CI 5, 8 & 11 Veteran
Originally Posted by RED99
Cam and/or headers should get your there. I agree with the guys above, The Mods you have listed above isn't going to do that much. I think you are going to have to make at least 50+ RWHP, and you won't get that from just mufflers/cats/X-pipe and a CAI. The spark plugs and wires aren't going to gain nothing.............unless you have a miss.
Safety Car
Joined: Jul 2005
Posts: 4,275
Likes: 4
From: Vancouver WA
This is what you need. 
This is a Z06 with there LG LT headers and there GX3 Cam
http://www.lgmotorsports.com/gallery...album=3&pos=12
This is a Z06 with there LG LT headers and there GX3 Cam http://www.lgmotorsports.com/gallery...album=3&pos=12
Last edited by RED99; Sep 27, 2005 at 10:34 PM.
Pro
Joined: Jan 2003
Posts: 637
Likes: 0
From: Laurel MD
St. Jude Donor '03-'04-'05-'06-'07-'08-'09-'10-'11-'12-'13-'14-'15-'16-'17
Sorry to add to the bad news, but you won't get there without a little more. I have a Halltech TRAP, 160 thermostat, LG Long Tube headers (no cats) and Borla stingers with LS1 edit and I am "only" at 390 RWHP and 372 ft/lbs torque. My car started life as a 349 RWHP stocker, maybe you've got one of those rare cars that came from the factory with 360, then you might be able to get there. As far as the headers and your warranty go, you might be surprised. I was told I would only be charged labor if they had to remove the headers for a job that normally wouldn't require them to (with stock headers). Good luck!!!
Supporting Tuner
Joined: Sep 2004
Posts: 51,896
Likes: 39
From: ================== Houston, Texas www.englandgreen.com ================== Necessary Evil™ __________
CI 6-7-8-9-10 Veteran
St. Jude Donor '05-'06-'07-'08-'09-'10-'11-'12-'13-'14
Stock for stock, your LS6 has 55bhp (about 40rwhp) more than my LS1 but still....
All this below (and that is a BIG cam) :
Comp Cams custom grind 234/240 598/608 114LSA, Crane duals, Harland Sharp roller rockers, chromemoly pushrods, titanium retainers, LS6 ported hi vol oil pump, LS2 timing chain, Magnacor wires, 160deg thermo, Dynatech headers, high flow metal matrix cats, x-pipe, Stingers, Blackwing, UD pulley, ported TB, stock LS1 heads, A4, stock TC, killer tune by Slowhawk of Dez Racing.....
Equals to this : 384rwhp, 364rwtq
If I add AFR Heads I will be in the 440-450rwhp range - but that costs $2000+....
That last 16rwhp gets harder and becomes more expensive to achieve.
All this below (and that is a BIG cam) :
Comp Cams custom grind 234/240 598/608 114LSA, Crane duals, Harland Sharp roller rockers, chromemoly pushrods, titanium retainers, LS6 ported hi vol oil pump, LS2 timing chain, Magnacor wires, 160deg thermo, Dynatech headers, high flow metal matrix cats, x-pipe, Stingers, Blackwing, UD pulley, ported TB, stock LS1 heads, A4, stock TC, killer tune by Slowhawk of Dez Racing.....
Equals to this : 384rwhp, 364rwtq
If I add AFR Heads I will be in the 440-450rwhp range - but that costs $2000+....
That last 16rwhp gets harder and becomes more expensive to achieve.
Oh, by the way this is a LS1 
Supporting Tuner
Joined: Sep 2004
Posts: 51,896
Likes: 39
From: ================== Houston, Texas www.englandgreen.com ================== Necessary Evil™ __________
CI 6-7-8-9-10 Veteran
St. Jude Donor '05-'06-'07-'08-'09-'10-'11-'12-'13-'14
Originally Posted by bigred6906
Hey guys....my goal for my Z06 is about 400 RWHP....right now i have borla stinger catback, halltech intake with ssm filter and throttle body bypass installed......here is what im thinking......add: x-pipe, random tech high flow cats, 160 degree thermostat, beru plugs, msd wires and a LS1/LS6 Edit professional computer tune by Bill Kelley Chevrolet......I didnt say headers because i am worried about voiding my warranty.....do you think i will reach my goal.....if not, give me some ideas....thanks
Stinger cat backs = 5rwhp maybe, probably less
Halltech intake = 10rwhp, maybe a little more
TB bypass = 0rwhp
X-pipe = 2 or 3rwhp if that much
high flow cats = 0rwhp without headers
160thermo = 0rwhp unless you reprogramme your fans
beru plugs = 1 or 2 rwhp
MSD wires = 2 or 3 rwhp
Tune = 10-20rwhp if you have major mods (heads/cam etc.)
So, you have just spent a LOT of money - and have very little gain for your expenditure.
A medium cam, headers and intake will bring you to 400rwhp easily, because you have a Z06, you have the higher flowing LS6 heads (higher than the LS1).
Most importantly, what is your driving style? Stop Light to stop light warrior? High speed king? Twisties? Legal Drag? Sanctioned Road race?
Your driving style is what should drive your performance mod decisions, IMHO, and not peak horsepower numbers.
There are C5s on this Forum that are making less peak HP than I am, but they could probably use me to wipe the floor. Power "under the curve" is much more important than peak numbers as is a flat, fat torque curve - unless you will be driving at WOT 24/7.
Food for thought. Good luck.
EG
Team Owner
Joined: Jul 2003
Posts: 34,299
Likes: 1
From: [Enter Unoffensive Comment Here]
Cruise-In VI Veteran
Cruise-In VII Veteran
St. Jude Donor '06
Originally Posted by bigred6906
so with the same setup i posted originally plus long tube headers....i should be somewhere around that area correct??
Race Director
Joined: Jan 2003
Posts: 14,285
Likes: 0
From: Houston, Tx Got traction?
CI 5-6-7-8-9-10 Veteran
St. Jude Donor '07-'08
Originally Posted by lager99
390 would be a big number, probably closer to 380-385. you won't get to 400/410 w/o headers /cam.
Chris
Burning Brakes
Joined: Jan 2005
Posts: 1,239
Likes: 4
From: Shelby Township Michigan
Nitrous is your answer. Cheapest HP for your money and it's easy to remove for warranty work. With a progressive setup you can throw a lot of juice at your motor and not put a lot of strain on it. I love the juice.