considering the 4th and 5th gen ludes share the BB chassis code, the exhaust systems should be very similar. i know the majority of suspension components will swap from a BB1 to a BB6 chassis.

the difference is the header downpipe, the B-pipe, and the cat as they have different lengths on the BB1 chassis. even with that, i still think the muffler itself should be able to be swapped over from a BB1 to a BB6 application as the routing is very similar. maybe you can order the 5th gen B pipe with a 4th gen muffler and just bolt the two together.

IMO i prefer my dual tip stealth setup.