I have the TVS with ZZP midlength header & 3"DP. Its connected up to the GMPP cat-back which is 2.25" diameter. definetely need to go bigger but can't decide between the Magnaflow 2.5 set-up or the Hahn 3". I am concerned that if I go 3" I will loose too much low end power. The magnaflow set up is $475 and hahn is $600. The outlet on the DP is 2.5" which would also create a restriction at the joint. Any advise?

 

how much whp you pushing i know everyones says if 300+ is 3inch all the way back so id buy 3 inch header dp and hahn and then sell your left over stuff and with a tvs theres no reason you shouldnt be hitting 300

 

remove the step down the downpipe, and go with a full 3" catback, if you dont plan on breaking 300whp, than go wtih a 2.5" catback, and keep the step down on the downpipe,


u have a PM