I just got my SLP longtubes installed and went with the off-road pipes. Now there's a rattly raspy sound that sounds like 'buckshot rattling in a coke can' whenever I let off the gas to shift. Is this normal with the off-road pipes? Will putting the cats on get rid of that sound? I closed the cutout and, although its better, its still there. The sound is great when accelerating, just a very annoying buzzy aftermath.
