Do the 'oettle' bypass. Take it to a fabricator and ask them to drill a hole in each pipe that goes into the muffler, and a hole in the tailpipe in each side, and just two pipes joining them up.
The result is a sound that sounds exactly like the Porsche Sports Exhaust (due to it being the same technique of bypassing the muffler), original looks, and being VERY cheap to do. It cost me £130 GBP, all in.
Before:
After:
And the real PSE:
Notice the similarities?
This is mine:
https://www.youtube.com/watch?v=Thocwey5K9w
https://www.youtube.com/watch?v=N71oYX-ejZk
I'd recommend it to anyone
The best thing about it is that it's eliminated the drone you get at certain revs on the motorway. So it makes the motorway journeys more comfortable, while making it sound incredible.
Look into it!