N52/N51 FAQ
What is the link for the Aliexpress headers?
https://www.e90post.com/forums/showthread.php?t=2020224
Which 22RPD tune should I use?
If you have a stock car or near stock car, you will need Stage 1
N51-
https://bavautoparts.com/products/22rpd-n51b30-stage-1-tune-1
N52-
https://bavautoparts.com/products/22rpd-n52b30-stage-1-performance-tune
If you have any of the following: Headers, MILVS, Any intake manifold other than what came on your car, you will need Stage 2.
N51-
https://bavautoparts.com/products/n51-stage-2-tune
N52-
https://bavautoparts.com/products/22rpd-n52b30-stage-2-tune
Should I upgrade my injectors or fuel pump?
You do not need to upgrade your injectors or fuel pump unless you are running E85 or boost.
E85 requires the following injectors plus the Stage 2 tune
https://bavautoparts.com/products/60-bosch-ev14-injector-48-5mm-n52-upgrade
Boost will also require these injectors, and possibly a fuel pump past 400+ whp.
How do I install a catch can on my N52?
https://www.youtube.com/watch?v=lod-ZpPX6iU
How do I smoke test my N52?
https://www.youtube.com/watch?app=desktop&v=Xc0Owfkztbw
How do I make my N52 sound good?
Without headers:
135i N54 muffler + Resonator delete
With headers:
3" Exhaust merged at the transmission mount
How do I install a WOTBOX on my N52?
https://www.e90post.com/forums/attachment.php?attachmentid=1668680&d=1501783979