Working on a BMW E90 335i art piece today for a customer, going to be engraved onto black acrylic and then paint filled white. Here is a whole slew of links I have been using to put everything together. Lots of good info out there.

Car and Driver article

http://www.caranddriver.com/reviews/2007-bmw-335i-sedan-short-take-road-test

Wiki

https://en.wikipedia.org/wiki/BMW_3_Series_(E90)

https://en.wikipedia.org/wiki/BMW_N55

Stats and Lap times

http://fastestlaps.com/models/bmw-335i

N55 Tech manual

http://f30.bimmerpost.com/forums/showthread.php?t=854477

335i specs

http://www.auto-data.net/en/?f=showCar&car_id=9937

http://www.carfolio.com/specifications/models/car/?car=180576

Great post on the pros and cons with lots of info

http://www.bimmerforums.com/forum/showthread.php?1598980-E90-335i-Pros-and-Cons

N55 article

http://wardsauto.com/vehicles-amp-technology/bmw-30l-n55-turbocharged-dohc-i-6