How: I cut the old stock muffler end off using a hacksaw right at the header pipe exit weld. There was some additional muffler core in the headpipe which then came out.
The universal 2.5" ID was just a little loose sliding over the header, so I crimped it down to match and sealed the trapp to the header using Permatex 101BR Ultra Copper silcone gasket (local auto parts store). The circular clamp (included) covers all the crimp scratches. For good measure, instead of installing one pin (included), I put on three (at clock points: 10, 12, 4 O'clock), using similar type flat-top screws from a computer hard drive. It's not quite finished until a welder fixes the rear set plates (included) to the muffler.
The Supertrapp came with 12 diffuser discs, but six discs makes for a nice exhaust growl/howl and even power delivery at my 4500 feet elevation. I use eight when hitting the canyons. However, this requires sneaking out of my neighborhood keeping the RPMs below 2,500. Once clear, I let her go!
Pros: Beautiful look & sound. Light weight & fits my bike. Possibly/probably more power throughout powerband. Easy to follow instructions w/diagrams.
Cons: Requires aluminum welds for rear set mount
Specs: Supertrapp 2 1/2 in. Inlet Universal Aluminum External Disc Muffler
Dennis Kirk Part #: 43950
Manufacturer Part #: 422-25000
KZ550 - SuperTrapp Forum Member - 2000 ZX-9r
