yeah thats my alternative. but if i were to get perrin, i'll get the exhaust cert to be align with the local law. Using a custom exhaust wouldn't be aligned.no idea. but you can go to a muffler shop and get a custom CBE made without breaking the bank. you would probably have to order the muffler that you like and have the shop modify it to make it fit.
there are other places that sell TBE's and CBE's.