GreySpector
Active Member
I've got secondary cat delete and MBRP catback. Used the same material but only installed in the hatch. Did absolutely nothing for me. Applying on the back seat is most likely the secret sauce.
Do you have aftermarket exhaust tips? If so, do they touch the plastic in the holes? I've got a theory a lot of my hum were vibrations being directly transferred by a lack of an airgap between the tips and car.
On a different note, that purple is sexy as hell.