Had my 335i for almost 2 months now and doing alot of Homework, already spoke to TMSS and DP is about R4800 with foolers if you running no SW, problem with putting JB4 first is, it will route out all the weak spots first like Chargepipes ETC so im holding off on that first when or until i find a buyer for my kidney LOL, besides that i would recommend you enjoy it stock for a while then when you get used to the power and the modding urge become to much of greatness then drop the DP in then chargepipe then JB4.......Just my 2c use it or dont you call bud.