N55
N55
335i · 435i · 535i · M135i · 1M · M2
Underrated engine. Most people tune it and stop there — this guide is for the ones who want to actually build it. Covers the whole process: what to do, what to buy, and what order it goes in, so you’re not undoing work six months later. Put together by someone who’s been through it, not summarized from a forum thread.
— SUPPORT
FREQUENTLY ASKED.
What is included in a tuning guide?
A platform-specific build path from stock to your power target. Mod order by stage, part recommendations, fueling and cooling requirements, and the failure points worth knowing about on that engine. Everything in one document.
How do I access my guide after purchase?
The guide is emailed to you directly after checkout. PDF, yours to keep.
What if I lose my guide?
Submit a ticket and we will try to get back to you same day.
Can I share my guide with someone else?
We’re not going to stop you. But these guides take real time to build and update, and the $25 is what keeps that going. If a friend’s on the platform, we’d rather you send them our way.
Refunds on digital products?
No refunds on digital purchases. Ask us anything before you buy — we don’t want you to regret it.
How current is the information?
We update the guides as the platforms evolve. New parts come out, old advice gets outdated, sometimes a failure mode shows up that wasn’t on anyone’s radar a year ago. When that happens, we revise. If you already bought that guide, the update is free.
How current is the information?
Guides are updated when significant new data is available for a platform. Purchase includes any future updates to the same guide.
Why pay for this when forums are free?
Forums are free if your time is. The B58 megathread on BimmerPost is over a thousand posts long and contradicts itself in three places. We read all of it, cross-checked it against dyno data, and put the actual answer in one document.
