Quote:
Originally Posted by Arnold K.
It is the cats. Did you take off the OEM brace that the cats hold on to? Do your aftermarket cats have mounting brackets on them? My ART Pipes without the brace made the shift knob rattle like crazy at 1800RPM (40MPH in 5th gear), so I had my shop custom fabricate brackets for the ART Pipes so I can use the OEM brace again.
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+1 to you, i really didnt think it was the ART pipes causing my rattle but now i know. it sounds like there is a washer or something loose in it that causes the rattle right in the RPM you are saying!