I'd be surprised if you get a dealer to modify your bike. Any modification to emission equipment including pipes, muffler, and carb is considered to be tampering by the EPA. The fine for tampering is $10k per occurance. An occurance is any day you ride your modified bike on the street (in the USA). So if you ride your modified bike on the street on Monday, Wednesday, and Friday, the fine could be $30k. Starting in 2006, the EPA mandated motorcycle emissions be reduced about 75%. Prior to 2006, the EPA left motorcycle emissions requirements unchanged since about 1980. The big question is will the EPA enforce the tampering law now that emission regs have gotten much stricter. If I was a dealer I wouldn't take a chance. In fact I probably wouldn't even work on your modified bike and/or honor the warranty. I don't mean to rain on your parade - just thought I'd give you something to think about.