both are fmf pipes, here are the side by side comparisons
left is my previous fmf gold fatty right is the riva racing by fmf..
the butt dyno results are in..
the riva hands down ownes the fatty!!! i lost a titbit of low low end but gained huge mid and high rpm power!! i grabbed a hand full of 3rd and almost flipped over back wards!!!!
and the sit mint is slightly better also! so... the decision is.. the fatty will find its way to a new owner


left is my previous fmf gold fatty right is the riva racing by fmf..
the butt dyno results are in..
the riva hands down ownes the fatty!!! i lost a titbit of low low end but gained huge mid and high rpm power!! i grabbed a hand full of 3rd and almost flipped over back wards!!!!
and the sit mint is slightly better also! so... the decision is.. the fatty will find its way to a new owner