They are NOT a perfect fit. I cut off the stock tab on the right frame downtube for mine and built a midpipe half from a 450R and half from a 350X - ended up with 2 nice clamps 
I offered the whole setup for 80$ with the HRC tip (BIG HOLE that was 35$ alone) which required and appreciated a larger main jet and holes in your air box lid and no one wanted it.
Somewhere you ought to be able to find my topic with pics in T-Vania.
Regardless, the Supertrapp is the way to go and mounts to the upper shock mount so the tab I chopped off was useless anyhow...........
All our government does is distract us while they steal from us, misspend our tax $ and ruin our country