Need advise on next mod.....
Thread Starter
Race Director
Joined: Dec 2002
Posts: 11,573
Likes: 10
From: Louisiana
St. Jude Donor '07
Need advise on next mod.....
LT4 – w/ 50,000 miles. Runs strong.
I have done the following mods.
Open air lid
52mm throttle body
4.10 gears
LT1 edit w/ programming
Modify mass air flow sensor
Low temp. Thermostat.
Dyno & set up – (326 rwhp & 303 rwt)
Next obvious move is exhaust. Shop suggests TPSI long tube headers and custom exhaust using Corsa mufflers.
What would you do next?
Any thoughts or suggestions.
I have done the following mods.
Open air lid
52mm throttle body
4.10 gears
LT1 edit w/ programming
Modify mass air flow sensor
Low temp. Thermostat.
Dyno & set up – (326 rwhp & 303 rwt)
Next obvious move is exhaust. Shop suggests TPSI long tube headers and custom exhaust using Corsa mufflers.
What would you do next?
Any thoughts or suggestions.
Race Director
Joined: Aug 2003
Posts: 11,043
Likes: 3
From: San Jose Pat Tillman - American Hero
Wow...impressive numbers considering the limited number of mods you have! Considering the gears aren't really a HP mod, you basically have a s**t-ton of HP from an open lid and tuning! Nice!!! Now...I have to say that I completley agree with others on the exhuast & headers... I would say go for the Exotic Muscle LT headers. There's a member here ("Zix") who has TPIS on his modded up LT4, and he plans on switching to the EMs when he completes his new "project." I have been nothing but pleased with mine, and would recommend them to anybody. Fitment is excellent, and noticeable performance gains to boot.
My numbers are similar to yours in the HP column with no tuning, but just bolt-ons. 324hp was my best pull... The difference comes in my Tq vs. yours. 325 for me vs. 303 for you. Now, I didn't do a pre-header dyno, so I don't know exactly how much they gave me, but I can't imagine you'll be doing too bad with 'em!
Headers seem like the way to go. Do it.
My numbers are similar to yours in the HP column with no tuning, but just bolt-ons. 324hp was my best pull... The difference comes in my Tq vs. yours. 325 for me vs. 303 for you. Now, I didn't do a pre-header dyno, so I don't know exactly how much they gave me, but I can't imagine you'll be doing too bad with 'em!
Headers seem like the way to go. Do it.
Burning Brakes
Joined: Apr 2002
Posts: 934
Likes: 0
From: MO
I agree also! Longtubes make a nice improvement! I have never had a problem with my TPIS LTs They fit great and are easiest installing headers I have ever done. You Will LOVE Them either way you go TPIS or Exotic! They got my car to 12.7x's consistent in pretty stock form from the 12.99-13.0x range.
Le Mans Master
Joined: Jul 2004
Posts: 9,835
Likes: 0
From: In front of C6s.
St: Jude Donor '10
Originally Posted by 94Polo6Speed
Long tubes. The motor NEEDS to breathe. Especially with the other mods. 
And Corsa=excellent choice 
Last edited by LilR3dCorvette; Nov 22, 2004 at 12:03 AM.
