fmf full exhaust setup

Hello everyone! I have a 2015 wr450f that I am building into a fully street legal supermoto. To start off I live in massachusetts and and financed the bike from a local dealer. From what I hear it is a big pain to title a dirt bike in mass(because it take so damn long, nh only takes 30 days or...

I recently purchased a 06 suzuki drz 400. Bike came with a jetkit(unsure of jet sizes) 3x3 air box mod and yoshi slip-on to a fmf header, bike ran perfecty fine. I just recently replaced the yoshi slip-on with a Fmf powercore 4 to complete the full Fmf exhaust system. The bike now needs to be...