Join Date: Jan 2012
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Yup, I heard the whoose sound as soon as I put on the 6637, love it.
If you still have the stock muf you should consider the Walker BTM muffler
which is direct flow, meaning a through and through channel as big or bigger than the diameter of the pipe. You can drop a baseball though it and love it's sound too; throaty but not raw like a straight pipe plus it will pass inspection in muffler required states.
The stock muffler is on the par with the stock box filter and both of those together don't amount to cr@p as far as letting your engine breath.