Thinking of fitting a Lukey muffler (the one that release some of those kw). Now the questions are, firstly is it a simple bolt on job and secondly will I need to make a cutout in the bumper bar? Does anyone have a template/drawing/ dimensions for the cut out (maybe a hole saw can be used). Anyone who has done this, comments please.

Im fairly certain the lukey bolton (AL4-5711) is a dumpy tip. So you shouldnt have any issues with bumper clearance.