Billy,there is plenty of room under that boat for round pipe with "X" and stay 3.5 out the back.Being from LI,you know you are supposed to run a minimum of 3 chambered muffler at E/TOWN.I went with hooker aero chambers{they were approved by e/town tech} when I took off my 3.5 Ultra flows and installed a 4 inch stainless exhaust out to the rear bumber.

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HEMI-ITIS has no cure.
My condition is fully BLOWN!!