ill try to explain what i did-pardon my english-apart from the bottleneck section close to the resonator,early borla systems have a sort of ring inside the pipe,about 4-5 inches in front the resonator,supposedly to cut the resonance in the car...the ring is almost an eight of an inch thick,so that cuts down the pipe to about 2.125''...i got rid of that too...i dont remember the brand of the x-pipe(2.500''),but removing the resonator,bottleneck section and the ring inside the pipe made the car a lot more responsive(seat of the pants...no dyno),still NO resonance(im half deaf!),and not loud at all(i could stand more noise)...i have stock exh. manifolds for now,but the ssw are on the shelf,waiting for winter(soon
),along with ported heads,and hi-flow cats.
bj
91/1735