We got a mongoose 4 inch on the s2, but i want a 3 inch.....but to be honest, i think its fine the way it is, apart from when it rattles because it scares me i always think its something not supposed to be making that noise But it doesn't come too far out at the back unliek some exhausts which is handy......one thing it aint handy for though is bumps I HATE the scraping sound of metal