finally got it what a nice pipe!i was hoping for a smaller one but it is still sweet.i took the core out of the stocker rode it and then installed th yosh without the sparkarrestor.i didnt think there would be a whole lot of difference a the stocker performs good but wow!o comparison.ton more mid and upper power.it is quite a bit louder than the uncorked stocker though wich is actually pretty mello.