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For over the top obnoxiousness, you can purchase the SLP Loudmouth.
I suggest one of the following: Corsa (prem. tips of course), Flowmaster 80 Series (Check out diff. in regular and Dyna Flow tech. Flowmaster), and Mufflex (as much as 4in.)
Dynomax also has a nice sound.
Martin '01 Formula - MTI Air Box Lid, K&N Filter, Hurst-6, SLP Cold Air Induction & Smooth Intake Bellow Corsa Catback w/Premium Tips '83 V45 Magna