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A different muffler is best way to change the exhaust sound. You can adjust the length of the pipe, diameter of the pipe or what frequencies are dampened. The 2.5" pipes with 12" glass packs should be pretty throaty. Have you broken out the fiberglass in the mufflers yet?
i have a SI/DO Original 40 Flowmaster, with 2.5" piping and 4" Slashed Chrome Tips, Has a nice deep start up and idle but when you step on it has a nice scream to it. Sounds really mean. Heres a clip of the start up and rev