There has been alot of talk and tons of webpages the have been debating over the size of exhaust depending the horse power level you are at or wont to gain. The stock GT has 2-1/4. Im going with a 3''o2, 3'' CQL down pipe with a catco CAT. 2.5 piping with a vibrant resonator ( can be found at modernperformance.com ). All that should provide better spool at lower rpms and a nice exhaust tone : ) and on the plus side its WAY easy on the wallet
all that ran me 322.00 bucks just got to find the time to do the welding and the install. There lies the real challenge for me.