brian,
If you dont want to spend alot of money do it yourself just go down to autoZone and order a replacement muffler.
or
Look for a sinlge exit cougar exhaust also check out the BAT catalog online the pasesetter system at ($189)for the cougar can work but some work needs to be done to hang the tips.
you might be better off calling to speed shop they might be able to just put on a high flow muffler on your system.
