on a scale from 30 to 70.. with 70 being the loudest
You've got your numbers backwards, the lower the number the louder.
I have a Delta Flow 40 on my 318 with the stock pipe and its very tolerable. Hardly notice it. Girlfriend doesn't complain so it must be ok
go the rustysoffroad.com and they give you a new cat back system for 169 dollars with the df 50. We put one on our xj and it sounds awesome. I am getting one for my zj except with the original 40 muffler and a freeflow cat.
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