does anybody know how good our muffler systems are. I just got done reading the article on the steeda system on a 01 gt...and they got 10 hp to the wheels and 10 ft/lbs. that was with the whole cat back system, 2 1/2 inch mandrel bent tubes etc. I think their mufflers are borlas right? Think there is that much improvement in our systems? how much of that hp increase do you think is due to the muffler efficiency of borla and how much is due to the better tubing?