+1 on the SS pipes. Pull the baffles (one screw) and I don't think you'll find anything louder than a long, empty pipe. Rode mine for an evening without baffles and the neighbors started a petition...
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Specialty Spares long cannons (of course I am partial here)...loud, look great and good price. I definately turn heads upon start up and can make the phone jump out of a drivers hands 
