I was not aware that Dinan offered a resonator delete option. It is curious that this option deletes the rear resonator only. A thread earlier this year
(
http://www.2addicts.com/forums/showthread.php?t=1331649)
reported that deleting the rear resonator made no noticable change to the exhaust sound on a M240i.
In contrast, there have been several threads indicating that deleting BOTH resonators (either via a Dinan midpipe or by simply having a muffler shop weld custom pipes in place of both resonators) resulted in pleasing sound improvements
(
http://www.2addicts.com/forums/showthread.php?t=1352934).
So far, there is no report on just deleting the FRONT resonator and replacing it with a custom pipe. I hope to try that when I get my M240 since it would be the least expensive option with no obvious disadvantages.