Howdy! (N54 swap research)


New Member
Mar 11, 2023
Hi there! I'm here to research for my upcoming n54 swap and to learn all things boost!
I currently have a 2005 bmw 330xi (e46) that's basically stock apart from the custom long travel coilovers, custom built winch bumper and roof rack, full underbody skid plates, 4.44 diffs, and 30in all-terrain tires.
It does amazing off-road and it's a blast to drive. Sadly it's developed a leaky headgasket :( as it's an m54 I'm assuming the head bolts are ripping out of the block. The car has 168k on it so the 'ol gm trans is starting to slip and become sluggish, the transfer case is growling, and the engine makes enough power to be fun and hold its own against a RZR 900 but I'd love to be able to keep up with a 1000r šŸ¤£

I also own a 2008 bmw 535xi that is FBO with VTT GC lites and water/meth injection so I'm no stranger to the n54 and I think merging it with the lifted e46 would be just about the best thing since sliced bread.

Here's the plan: Lifted e46 with an n54 backed up by an 8hp45x trans while retaining the AWD.

I've got a n54 335 parts car along with the 8hp transmission and atc450 transfer case from a 2012 x5. All I need now is some extra knowledge to put it all together! If you have any tips and tricks on n54's or 8hp transmissions I'd love to hear them! Thanks for reading!


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