Join Date: Jul 2013
Location: Yorktown Heights, NY
3" is a little bit overkill especially with the older 5.7L. I'm doing SRT shorty headers on mine which have either a 2.75 or 3" collector area, to 3" cat-less mid pipes, to 2.75" stock SRT catback on my R/T with the newer 5.7L. From what i've been told even this is a little overkill, but oh well. You should be fine with that setup, however it's going to be LOUD LOUD LOUD all the time.
Bigger exhaust piping isn't always better. It comes a point in time where it's just overkill. Exhaust systems work on scavenging. The exhaust pulses work in such a way that one pulse is used to help pull the other out away from the engine. By needlessly increasing the size of the piping, you are changing the rate at which the exhaust pulses can effectively scavenge and therefor hurting performance in some aspect. Will you make more power with this system compared to stock, the way you have it planned out currently? Yes. Would you make more power with this same setup, but in a 2.5" trim? Probably.
There are times where it is necessary to increase the exhaust diameter, such as instances of larger displacement engines, forced induction, etc.
2011 Dodge Charger R/T Plus - SOLD
2013 Dodge Dart Rallye Multiair Turbo - SOLD
2012 Chrysler 300 SRT8 - The new whip
Last edited by RT_HEMICHARGED; 11-10-2013 at 11:31 AM.