exhaust not worth it?

georgeleedom · Post by **georgeleedom** » 22 Sep 2010, 08:27

I have a '99 GLT. I recently upgraded to a 16T turbo, blue injectors, and a SRI. I have ordered a 3" down pipe, sport cat, & 2.5" exhaust. The various parts sites, such as IPD, recommend their 3" dp. So does about everyone on these forums. However, I spoke to two different people who build race engines for a living. They both said adding a 3" pipe without modifying the rest of the exhaust adds nothing. They also told me that a 3" dp and 2.5" back is too much exhaust, making the 16T spool up too slowly, as it requires more resistance than that to fire.

I would appreciate any and all opinions on this, especially anyone who has made the mods and can provide actual comparisons.

Thanks,
George

Post by **JRL** » 22 Sep 2010, 14:36

I agree with most of this
Why don't you go with their standard 2-1/2 DP or buy their complete exhaust system?
They do need a bit more breathing. Will it give more HP, not much, but they're corect about the spool up plus a decent exhaust will dissapate the heat more quickly thus making everything a bit cooler. It will help the transmission and in the long run, the turbo itself