It would be cool if you could post some specifics of the differences (et/mph) between the systems. I assume the car under test is the Duster with a 408? Thanks.
Yes, the Duster with the 408 about 7 years ago. Several parts have changed since then (fuel system, ignition, torque converter....), but the homemade exhaust is the same. Time slips are long gone, but I remember the testing on a Friday night at the 1/8 mile track. It ran 8.15 open, 8.04 with the x-pipe and 8.05 with the mufflers. The exhaust goes 3" collectors, 3" pipes, x-pipe, mufflers and dumps before the axle. Was pretty simple to swap the pipes on in the pits after the first run, and the mufflers are clamped on. I figured the x-pipe would help due to reading many other dyno tests proving their worth, but the mufflers surprised me. They don't cost any power, so may as well keep my hearing somewhat good by using them over open pipes.
