I'm going to mod my son's exhaust this weekend(yamahadudes PDF)...I can't find stainless steel scouring pads so I going to use aftermarket exhaust packing. Is it all pretty much the same stuff or is one kind better than the other?(Hopefully my local dealer has some in stock). I'm going to drill the holes in the core and cut off the larger cone...can i leave the fan thingy and spark arrestor(small cone on the end i think) on or should i cut that off too? How do i go about packing the exhaust? Is it the packing loose stuff or is it something you just wrap around the core?