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40 is pretty loud, try 50 or 70 series
 
umm

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 ;)
 
df 50

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.
 
i have a 40 series and it is a bit loud IMO. not as loud as my cutlass w/ headers and blow out mufflers, but still more noise than i would like.

i wanted a 50 but of course none of the shops i called stocked one.
 
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