[fgpalmer71]

Originally Posted by ky0u

So this is somewhat true, but that being said, running a stage 1 flash is relatively safe as it's a pretty conservative tune.
JB4 was one of the original game changers back before we had DME flashing at the level we do today. It was a physical piggyback. They are still going today and have updated their functionality, the current day JB4 has the ability to run in tandem with MHD which gives you the best of both worlds. Eventually down the road, you may want to explore doing this as it'll allow you to take advantage of JB4's failsafes

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OP I agree with pretty much everything everyone said, as you can see, its fairly unanimous across the board regarding the typical Bolt on process as well as addressing problem areas.

To put your mind somewhat at ease, the n54 is indeed finicky, but it's also become pretty overhyped with notoriety and heresay over the years. It's not an engine to work on for greenthumbs, but if you're mechanically inclined at all, it's not too bad for a BMW. Just make sure you run through and take care of the maintenance items outlined in this thread. FCPEuro is your best friend here

Chargepipes - OEM is plastic and at this age likely brittle. Any significant bump in boost/power puts it at risk of blowing

Coils - I second Torgus suggestion, go for the Eldor coils that were used in the S55 powered ///m cars. Theyre direct plug and play

Plugs

Vacuum lines - Likely brittle due to age, common factor in causing the 30FF code due to boost leak

Boost Solenoids- Can also trigger 30FF if they're going out, these should be swapped out every 50-60k miles or so

Other stuff like the Downpipes, intercooler, intake, etc are fine stock to run a stage 1 tune (assuming theyre not busted). Upgrading them will allow you to run stage 2 stuff

Thank you!