Ehaust Header and CAT replacment 2003 C4S

[O3C4S]

Have 03 C4S 55K mi. Both Cats going bad. getting CEL after every 50 to 75 mi. First from bank 1 and now bank 2. Have  basic Torque App software to reset. Pain in Butt.

I track car about 3 times a year. No car mods. Run for fun.

Looking to boost HP via new performance exhaust system. Thinking Headers and Sport CATs from Fabspeed. Factory mufflers are original, seem fine and would like to reuse.

Along with perhaps new clamps, gaskets and a few new bolts, does anyone have advise on this? 

[JFP in PA]

4 hours ago, O3C4S said:

Have 03 C4S 55K mi. Both Cats going bad. getting CEL after every 50 to 75 mi. First from bank 1 and now bank 2. Have  basic Torque App software to reset. Pain in Butt.

I track car about 3 times a year. No car mods. Run for fun.

Looking to boost HP via new performance exhaust system. Thinking Headers and Sport CATs from Fabspeed. Factory mufflers are original, seem fine and would like to reuse.

Along with perhaps new clamps, gaskets and a few new bolts, does anyone have advise on this? 

 

While just about everyone selling headers and exhaust systems make large HP improvement claims, in reality they are typically very small. if any improvement at all, when tested on the dyno.  The exhaust systems the factory used are actually pretty good all by themselves, and drone free which is more than many aftermarket systems can claim, so reusing your stock mufflers is not a bad idea.  Another option is picking up used cats off a wreck; we have done that for several customers with good results.

[BufordTJustice]

 
While just about everyone selling headers and exhaust systems make large HP improvement claims, in reality they are typically very small. if any improvement at all, when tested on the dyno.  The exhaust systems the factory used are actually pretty good all by themselves, and drone free which is more than many aftermarket systems can claim, so reusing your stock mufflers is not a bad idea.  Another option is picking up used cats off a wreck; we have done that for several customers with good results.

JFP, do you recall the name of the guy/Company who modifies factory mufflers, does the "gundo" mod properly, and then can recoat them in ceramic?

I can't recall the name off the top of my head.

Sent from my SPH-L720T using Tapatalk

[Ahsai]

http://fdmotorsports.net/fister-exhaust-996/