[3tas4me]

In doing the restoration on my 1974 Trans Am, one item I replaced was the complete exhaust system. I had originally bought the car in 1997 and the factory exhaust was shot. I bought a pair of Flowmaster mufflers, took the car to a local exhaust shop, and had a custom true dual exhaust system installed with an "H" pipe. The car seemed to pick up power and sounded great other than the drone it had at about 40-45 mph. I believe the system was a 2 1/2" system but I could be wrong and maybe it was a 2 1/4". Anyway, I bought the PYPES X pipe system for the car, the one with the crossover muffler that mounts behind the rear axle. This system is 2 1/2" mandrel bent.

I haven't driven the car much yet, but did drive it about 40 miles one day last week. It seems to me that it doesn't have the throttle response that it used to have with the old system or the performance. I don't have any hard numbers from a dyno to back this up, just going off how the car feels. Of course, I am comparing to what I remember from years ago. The car is completely stock other than the exhaust and has only 49k miles on it. It is a 400 4-speed. Any thoughts? Does and X pipe system actually lose low end torque?