This is not really a review, at least not yet (unless someone wants to supply us with a DINAN 335i S2). DINAN has long been a tuner of BMWs and up until recently was available and numerous BMW dealerships (as they were DINAN authorized). However, with BMW bringing their own performance products to the table, some BMW dealerships are starting to drop their partnership with DINAN in favor of installing their own performance products.
This story comes from an interesting question found on the internet. Given the choice, would you purchase a DINAN 335i S2 or a original BMW M3. http://forums.bimmerforums.com/forum/showthread.php?t=1296196. Key arguments against the DINAN 335i S2 is that by the time you put all of the items available from DINAN on a 335, you are within 3-5k of the price of an M3 and you don't get some of the trick items available on the M3. Other claim that buying a DINAN 335i S2 makes you different than the crowd, making you more unique and more of a "sleeper" keeping prying eyes at bay and keeping insurance premiums low (compared to the M3).
So what say you... stop by the link and vote. It will be interesting to see the outcome. http://forums.bimmerforums.com/forum/showthread.php?t=1296196