MZ65 Belly Pipe with Dyno Tested 18% Power Boost. Designed to Fit on The Felt Faker Gas Tank Frame. Also fits Classic Style Beach Cruiser Frames Manifold fits 40mm bolt spacing exhaust ports on standard 80cc and 100cc Cylinders. Design of Pipe requires use of the included Large Frame Front Mount and Support Bracket. If you are not using a Felt Faker Frame this Pipe may not fit on your bike. Installation as an upgrade will require changing the way your engine is currently mounted. This is a new design and we have had limited success installing this on other Beach Cruiser Style Bikes