Marine Griz,
I have the 2" straight one, I at first put heat shield under my fender (I thought it would burn) after about 1000km it took it off (was ripped up from the air flow pressure) now another 1000km later, there is a slight dicolouration of the underside of the plastic, no melt, no warp!!
Aluminium is better, it cools quicker!
You need a very long drill bit (+/- 30cm) to get through both baffles, use a 12mm drill bit and start with 6 holes evenly spaced.
I started with 6 holes, then went to 12, then I sawed my silencer in half, cut out all the baffles with an aceteline torch, welded the silencer back together, refitted the spark arrestor (for back pressure),
I love it like this, but MAN IS IT LOUD!! it makes the sports quads with aftermarket pipes sound like they are blasters with standard pipes on!