OK over at cta motorsports they dynoed a svt contour with a there down pipe, which i believe they sell bat downpipes. Well the pipe with the cat gained both Tq and HP all threw out the power band. Now the downpipe without a cat lost Tq by -3 up to -7 threw the power band, hp was a little less at low rpms and only gained at 6k and above which was +2. Now that this qustion has been answer. On a stock exhaust and down pipe do not get a downpipe without a cat you lose low end and gain only 2 hp on top end. Plus you get alot more rasp. So please order own with a cat. thank you good day!
