After numerous of dyno testing, we found the FA20 engine loves 70mm piping. We were not seeing much horse power gains with anything smaller in pipe size.
We offer a stainless made 70mm exhaust to maximize the exhaust flow while gaining horse power. Dyno proven +6whp again. The 70R weighs 25 lbs (stock 41 lbs) with the b-pipe being resonated.
The exhaust also come with our latest designed tip with gradient finish.