You can also just un bolt the cats on a US spec muffler and put test pipes in, that any muffler shop can make up for under $150-$200 bucks and it would sound fantastic. All 8 cylinders will mix in the small exhaust box and sound very european. If you don't want to mess with your stock system you can buy mine for a fantastic cheap price. Just give me an offer. I need the room in my garage. You can also still use the stock black grate on the back. emery@hawaii.rr.com