Yosh or pro circuit

I recently went from FMF to Yosh full system and very happy with the results. I'd go Yosh all day.

Id look and see if theres some magazine articles that tested all of the pipes to see whos performed the best. I want to think fmf has the most testing time with yamaha. Procircuit probably follows them. All of them are good and the difference is probably so small you wont notice.

I wouldn't throw out Dr. D either.

Dr D is actually really sick. He knows his Yamahas for sure.

another vote for Dr. D on the Yam... my titanium/carbon was very nice and sounded great.

Don't skip FMF either. It did wonders for my 450. Some friends have said the same about their 250's

I've looked at Yoshimura full systems for my CRF, but the header looks quite similar to the stock, while other companies choose to use chambers and mega bomb type headers. It's leaves me curious.