SRX Dave, you can bore out the silencer on a srx for a much better sound and maybe some performance, definitally no loss, but you can not just take a hole saw up in there like you can do on a sx. You have to cut open the entire muffler, cut out a baffle and weld it back together. I am going to be doing this to my srx very shortly and I will let you know how it goes. I still have a stock one so this winter what I will do is do many high speed runs with my G-teck computer that shows all performance with the moded muffler and then I will do it for the stock muffler, I can also send you a sound clip. Later in the year just remind me about it and I will let you know. Where are you located? If you dont have the tools to do it, you can send it to my shop and we can do it for you. Let me know