I have a bone stock 03 X and was thinking of adding maybe a drop-in K&N and a muffler of some sort. I'm friends with the owner of an LS1 performance shop here in Dallas and he'll let me use the dyno for free. So I was thinking of doing a few pulls stock, add the filter and do a few pulls, then add the muffler and do a few pulls. I'm only going to do this if some of ya'll would be interested. So?