Quote:
Originally Posted by SomeGeoffGuy
From what I know about them they tune the mufflers to the stock system. So if you make a lot of changes, it might shift out of the muffler's tuning frequency.
I would give them a call and ask them - I think they have a tech support line. Maybe they can help?
-Geoff
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Well this sounds highly likely.
OP went from an axle-back to a cat-back, but also deleted the secondary cats. This is definitely going to change the frequencies of the system. I suspect the cat-back is intended to work with the secondary cats in place.
The pipe diameter isn't really what's important here, although that may alter the frequency a bit. The baffles are now gone and the effective length of the pipe where gases/pressure can oscillate has changed.