Hey all, after a bit of advice. I picked up a second hand Perrin cat back recently. The reason I searched for a Perrin is the thousands of reviews all over the internet stating it doesn’t drone.
So, now it’s installed it seems to be really ‘boomy’ between about 1800 and 3000 revs, even to the point that the garage door vibrates significantly while it’s idling. It is VERY deep in the low rev range and causes quite a bit of volume in the cabin at low revs. Outside of this zone it’s actually pretty quiet.
It was originally a non-resonated version, but the previous owner had a decent sized resonator welded in where the Perrin one would be (prob close to equivalent size). I thought this may be related, but most online feedback seems to indicate that even the non-resonated 2.5” Perrin doesn’t drone / boom. I can’t imagine the introduction of a resonator would create drone?
I saw quite a few people have had resonance issues from the clamps not being tight / aligned. I triple checked this and even had an exhaust shop check (with a stethoscope) - no leaks. The only thing left that I thought it could be is the rear muffler itself? Perhaps it’s lost its internal baffling over the years? Could this be possible? Are they repack-able? Anyone had a similar experience with a Perrin (no other exhaust mods)?
Any advice you may have would be appreciated. Thanks.
