I have read a lot of threads on exhaust and it seems a few people are worried about their car being too loud. I don't care if my car is loud as long as i gain more power. I don't have to pass emissions but i don't want turndowns or straight pipes w/no mufflers. I was thinking MAC LT's to a shorty prochamber hooked to a borla stinger cat back system on an 01 GT. Could i pick up 20 RWHP with this setup or is that asking too much. Would this reduce the backpressure too much on my stock engine and cause problems? My engine is stock except for a K&N w/the snorkel removed. I am planning on adding an upper intake and 70mm TB soon too. I know this setup will be loud and i hope it is. The strip in town sounds like a lawnmower festival with all the ricer pipes. Thanks to anyone who helps. Oh yeah, I already tried mustangexhaust.com but they don't give you power info just sound. Thanks.