I have a 88 GT and put hooker aero chambers because it had no mufflers and stock h-pipe. With the hookers it had a quiet somewhat high pitched rev. Then I installed bbk shorties and a o/r h pipe. Definitely got louder, but now I'm determined to get louder so I ordered american thunder cat back. I lost some low end torque with header h pipe change but it revs faster with more mph per gear. Wondering if the flowmasters will give some torque over hookers?