[itsnotanova]

I think it would be very easy to make the exhaust come out the rear area where the bumperettes are. Either use two small mufflers or one big muffler that has two going in and two coming out. Similar to what third gen camaro's use. I've made both exhaust systems on my two boxsters. It's not hard if you have a little fabricating skills and a welder. You definitively would need to modify the aluminum bumper though.