Long Tube header question
Thread Starter
Racer
Joined: Jun 2004
Posts: 431
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From: Northern NJ nj
Long Tube header question
I have an 01' MN6 C5. The only mod is a Corsa exhaust. Thinking about longtube headers. If my setup is just the Corsa exhaust and longtube header (and I guess I'll need a Dyno tube becuase of the headers), what kind of HP gains can I expect? Not looking to change the stock cats.
Thanks.
Thanks.
Supporting Tuner
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From: ================== Houston, Texas www.englandgreen.com ================== Necessary Evil™ __________
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St. Jude Donor '05-'06-'07-'08-'09-'10-'11-'12-'13-'14
Suggest LGM longtubes, RT high flow cats and x pipe as one bundle. Then change your stock intake, get a good tune and you should realise some decent numbers - 50+ HP conservatively.
Keeping the stock cats, stock H-tube and stock intake will negate most of the gains for your $$$ spent.
EG
Keeping the stock cats, stock H-tube and stock intake will negate most of the gains for your $$$ spent.
EG
Burning Brakes
Joined: Apr 2004
Posts: 866
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From: Bakersfield, Blown 402 Z06 Ca
I would say about 25 HP. If you change to high flow cats and X-pipe you may get a little more. This may be a low number, but I try to think in real terms. Anything above that just puts a big smile on my face. I'm just not sure I would Dyno after the headers though. That's money that you could have used for more upgrades. I'm running 340 rwhp and 347 rwtq. I have the Kook's 1 3/4 with high flow cats and X-pipe. K&N twin flow filter, 160 Therm and this is my numbers. Headers are great though. 
Premium Supporting Vendor
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From: Manassas Park VA
St. Jude Donor '07-'08,-'13-'14, '16-'17
25-35 if you do the whole run...do the intake at the same time and you should get 35-45. You'll feel it in the SOTP
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Team Owner
Joined: Aug 2003
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From: VA
St. Jude Donor '03-'11
Originally Posted by EnglandGreen
Suggest LGM longtubes, RT high flow cats and x pipe as one bundle. Then change your stock intake, get a good tune and you should realise some decent numbers - 50+ HP conservatively.
Keeping the stock cats, stock H-tube and stock intake will negate most of the gains for your $$$ spent.
EG
Keeping the stock cats, stock H-tube and stock intake will negate most of the gains for your $$$ spent.
EG
Once you start...
Team Owner
Joined: Aug 2003
Posts: 38,314
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Originally Posted by gairno
I would say about 25 HP. If you change to high flow cats and X-pipe you may get a little more. This may be a low number, but I try to think in real terms. Anything above that just puts a big smile on my face. I'm just not sure I would Dyno after the headers though. That's money that you could have used for more upgrades. I'm running 340 rwhp and 347 rwtq. I have the Kook's 1 3/4 with high flow cats and X-pipe. K&N twin flow filter, 160 Therm and this is my numbers. Headers are great though.
The KOOKS headers really made a big difference for me. And I would definitely change from the stock xpipe and cats.
Instructor
Joined: Jan 2005
Posts: 152
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From: Pompano Beach Florida
You guys keep saying swap the intake...Don't 2001+ already have the LS6 intake? From what I've read the LS6 intake is much better for a mildly modded car than an LSX. It makes more power down low. Am I wrong? Or by intake do you mean air filter (Vararam)??
Melting Slicks
Joined: Dec 2004
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From: New York NY
Cruise-In VI Veteran
St. Jude Donor '05
Basically it comes down to cost. If money is no object get the full LGM setup for $1750. If you want very comparable gains go with the dynatechs for just a shade over $1200 for the full system. If you dont switch over to high flow cats you are not going to realize the most superior gains. With your corsa catback, LT headers w/ cats, an aftermarket intake, and a good tune you should be able to pull down anywhere from 35-50 more rwhp.
Getting a good tune is not just about more power. It is more importantly about making the engine run optimally. A tune is necessary to bring your A/F ratios back into a reasonable range. Running excessively rich and especially excessively lean (higher engine temps) can put stress on the engine.
Getting a good tune is not just about more power. It is more importantly about making the engine run optimally. A tune is necessary to bring your A/F ratios back into a reasonable range. Running excessively rich and especially excessively lean (higher engine temps) can put stress on the engine.
Last edited by Icemanskis; Feb 9, 2005 at 02:21 PM.
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Supporting Tuner
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From: ================== Houston, Texas www.englandgreen.com ================== Necessary Evil™ __________
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St. Jude Donor '05-'06-'07-'08-'09-'10-'11-'12-'13-'14
Originally Posted by keen02
You guys keep saying swap the intake...Don't 2001+ already have the LS6 intake? From what I've read the LS6 intake is much better for a mildly modded car than an LSX. It makes more power down low. Am I wrong? Or by intake do you mean air filter (Vararam)??
EG
Team Owner
Joined: Aug 2003
Posts: 38,314
Likes: 35
Originally Posted by keen02
You guys keep saying swap the intake...Don't 2001+ already have the LS6 intake? From what I've read the LS6 intake is much better for a mildly modded car than an LSX. It makes more power down low. Am I wrong? Or by intake do you mean air filter (Vararam)??
Thread Starter
Racer
Joined: Jun 2004
Posts: 431
Likes: 1
From: Northern NJ nj
Originally Posted by gairno
I would say about 25 HP. If you change to high flow cats and X-pipe you may get a little more. This may be a low number, but I try to think in real terms. Anything above that just puts a big smile on my face. I'm just not sure I would Dyno after the headers though. That's money that you could have used for more upgrades. I'm running 340 rwhp and 347 rwtq. I have the Kook's 1 3/4 with high flow cats and X-pipe. K&N twin flow filter, 160 Therm and this is my numbers. Headers are great though.
Thanks for the response but how do you pass emmissions w/ high flow cats. That's my main worry. I will definitely add the x-pipe based on the advise received. (kinda thought that would be the case.) Thanks again to everyone!
Race Director
Joined: Aug 2004
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From: Winston-Salem North Carolina
St. Jude Donor '08-'09
NJ emissions
Originally Posted by vettenovice
TTT
Thanks for the response but how do you pass emmissions w/ high flow cats. That's my main worry. I will definitely add the x-pipe based on the advise received. (kinda thought that would be the case.) Thanks again to everyone!
Thanks for the response but how do you pass emmissions w/ high flow cats. That's my main worry. I will definitely add the x-pipe based on the advise received. (kinda thought that would be the case.) Thanks again to everyone!
Melting Slicks
Joined: Jul 2003
Posts: 3,427
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From: Fountain Inn, South Carolina
Originally Posted by EnglandGreen
Suggest LGM longtubes, RT high flow cats and x pipe as one bundle. Then change your stock intake, get a good tune and you should realise some decent numbers - 50+ HP conservatively.
EG
EG
EG, Are you the guy that adds up all the mods and ends up with 1,250 HP
Supporting Tuner
Joined: Sep 2004
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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 George8211
Huummm.... so that's conservatively ?? So what would be your non-conservative guess ... 75 - 100 HP
EG, Are you the guy that adds up all the mods and ends up with 1,250 HP
EG, Are you the guy that adds up all the mods and ends up with 1,250 HP
For additional RWHP, I bolt on Neon.
And Hey! Let me inform you folks that each inch of neon is worth 2.73rwhp (SAE adjusted). I've gained well over 36rwhp from the neon I've installed so far - and when I complete my stereo upgrade, I'll be good for a net gain of over 79rwhp!!!
Food for thought....
EG
Melting Slicks
Joined: Jul 2003
Posts: 3,427
Likes: 2
From: Fountain Inn, South Carolina
Originally Posted by EnglandGreen
And Hey! Let me inform you folks that each inch of neon is worth 2.73rwhp (SAE adjusted). I've gained well over 36rwhp from the neon I've installed so far
EG
EG
Instructor
Joined: Jun 2004
Posts: 105
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From: virginia beach va
I have Corsa indy and xpipe, '04 C-5 w A4
I just added Bassani 1 3/4 LT headers and hi flo cats. Before and after dyno shows 10 rwhp gain w/o tune. Not the biggest bang for your hp buck, but the sound makes up for it, it's awesome. I'll go back for a tune after intake mods.
I just added Bassani 1 3/4 LT headers and hi flo cats. Before and after dyno shows 10 rwhp gain w/o tune. Not the biggest bang for your hp buck, but the sound makes up for it, it's awesome. I'll go back for a tune after intake mods.
Team Owner
Joined: Aug 2003
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Originally Posted by drmgoat
I've been thinking about the headers and hi-flow cats too. Have you guys had any issues with leaks or codes after they've been on for awhile?
High flow cats can make you throw codes however and these may need to be addressed with tuning.
I just added Bassani 1 3/4 LT headers and hi flo cats. Before and after dyno shows 10 rwhp gain w/o tune. Not the biggest bang for your hp buck, but the sound makes up for it, it's awesome. I'll go back for a tune after intake mods
As far as passing emissions are concerned, well, I will soon find out.
Instructor
Joined: Oct 2001
Posts: 191
Likes: 1
From: Westport CT
Originally Posted by Icemanskis
Basically it comes down to cost. If money is no object get the full LGM setup for $1750. If you want very comparable gains go with the dynatechs for just a shade over $1200 for the full system. If you dont switch over to high flow cats you are not going to realize the most superior gains. With your corsa catback, LT headers w/ cats, an aftermarket intake, and a good tune you should be able to pull down anywhere from 35-50 more rwhp.
Getting a good tune is not just about more power. It is more importantly about making the engine run optimally. A tune is necessary to bring your A/F ratios back into a reasonable range. Running excessively rich and especially excessively lean (higher engine temps) can put stress on the engine.
Getting a good tune is not just about more power. It is more importantly about making the engine run optimally. A tune is necessary to bring your A/F ratios back into a reasonable range. Running excessively rich and especially excessively lean (higher engine temps) can put stress on the engine.
is it critical to get the tune? i've been told my '99 6-speeds's computer will totally adapt and make adjustments as it learns. i have a breathless ram air intake, and b&b cat back exhaust, and am about to install a set of KOOKS LT's and magna flow cats. am at the point of paralysis by analysis. any advice would be appreciated.
