I have the SLP LMs on my 02 GT with the stock mid pipe and they sound GOOD! Not quite as loud as I want, but I like LOUD! So the O/R H im getting should solve that. As for you, the mid pipes on the 05+ flows great. I would recommend the SLP cat back.
MARK 92 RED GT 5 Spd Still trying to find out what is on it. 2002 Silver GT 5 Spd
Gone. 4/10 94 Teal GT 5 spd
Offroad X pipe, 2.5" MAC catback, Underdrives, Steeda springs F/R, Lowered 3.08's, Smog delete Sold 12/7/09