bobster52

The turbo tuner is more difficult to install on the 535i vs 335i. I'm told it probably should be installed when car is on a lift, also turbo tuner would be better in 93 octane states. I would consider JB 1 or 2 and learn how to do the install yourself. You can get a lot of info on this subject at N54TECH.com .

jcool10181

Interesting... I would like to hear more from 535i owners who installed SB on their ride. Launching the car in sports mode is already fast. Question is how much difference in acceleration can a SB make on a TT engine?

IMO on piggy backs, I've been following the threads in e90post.com and have been hearing nothing but LIMPS, waste gate failures, and warranty being voided from V2, JB2, and Helix users. I was going to get a piggy back but changed my mind and will go for the Dinan Flash. Easiest hassle free install, full warranty, peace of mind of having not to worry of getting a limp or any other engine problems. Plus it's a safer tune than a piggy back. Boost is just right unlike piggybacks that beats the hell out of your engine from boosting around 15psi. Think about longevity. If you have a lease then non of these matters. Haha!