Thread: dinan+ ar20
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Old 01-31-2013, 01:38 PM   #13
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Join Date: Jan 2013
Location: Chicago
Posts: 54
My Ride: X5 / B8 S4
Originally Posted by n3985 View Post
Because 2 AR20s would be quieter than 1 AR20 + OEM resonator.

AR20 and AR25 are the same thing minus piping size, one is 2" one is 2.5".
Gotcha. The muffler guy did put the ar20 on some machine to stretch it. Maybe the ar25 is the better one for people to go with
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