Moto Grand Prix
Main Motorcycle: 2016 Triumph T120
Join Date: Nov 2006
Location: West of the Pecos, TX USA
Other Motorcycle: 2007 Ducati GT1000
Extra Motorcycle: 2003 Triumph T100
IIRC, the Motone is like the TEC in that it uses the original cat mount. I removed the entire exhaust system to install the Tec X-pipe. I think it's critical to install the header pipe openings straight onto the X-pipe, being really careful not to damage the graphite mesh gaskets. With the pipes hanging on their head studs and fitted onto the X-pipe, I cinched the header pipes to each other with wraps of masking tape across the X-pipe, to hold the header pipes together while I got the V clamps on their flanges. Otherwise, I was running out of hands and the header pipes would spring apart before I could get the clamps on. With the V clamps in place, slide the mufflers straight on, again being careful with the gaskets. Hang them with their hardware. Now, wiggle and tighten, wiggle and tighten, until everything is back where it needs to be, and tight.
If there's gasket damage, new exhaust leaks will show up as discoloration and sooting at the gaskets.
Be really careful with the O2 sensors on the headers. IIRC, each requires five complete turns to install. First, turn the sensor five turns in the LOOSE direction before threading on and tightening. Otherwise, the wires will kink and eventually break from the stresses. Pull the insulation away from the wires to be sure they are not twisted.
Photo: Ducati GT1000 at Utah's Bonneville Salt Flats