The BMW PE and the MMW setup definitely sound great. For those on a budget here is what I did. Total of about $150 invested. Muffler delete, OEM resonator deleted and replaced with aftermarket resonator (very similar to Vibrant bottle style resonator)
A few Revs
http://www.youtube.com/watch?v=DrKiI_UBqFM
Takeoff
DTC kicked on for a second because the street was a little wet
http://www.youtube.com/watch?v=wXP--jVPcJw
Driveby 1
http://www.youtube.com/watch?v=PaG4mdx8RUg
Driveby 2
http://www.youtube.com/watch?v=2giSQw3brx0
Roll on w/ windows up
http://www.youtube.com/watch?v=HEj8krghKyM