Have you turned yours into a 2.0? I hadn't even thought of that....
If you did what HP do you have? How did you do it?
I started with a e30 318i. In Australia they are m40 powered sohc timing belted buckets with about 3 kW move than your average go cart!
Loved the handling of the car though which was originally my mums. When she died I inherited it.
It basically lived in my garage for about 10 years!

But then I drove a 318is thinking to buy it! But couldn't see myself selling my e30. Also in oz they make it very hard to put an engine into a car that it didn't come out with!
So i brought an m42 engine and started rebuilding it.
When I brought the engine and it was running in car and was told it will rev to 9000k. Collision victim!
The dme chip was altered and I have not found any real non standard parts in motor to warrant those kind of revs!
I have rebuilt 2 engines before l20b and fj20t so when I took the rocket cover off the m42 I stood there and looked at hydraulic lifters and thought where are the tappets for about an hour!

Anyway metric mechanic do a complete m42 either 2l or 2.1l motor but they are very $$$$.
A couple of seniors around here have them but I still am waiting for photos. Would love to see them!
But a few years ago a guy came up with a cheaper alternative

By using s50 pistons 86 mm and m47 crank 87 mm 2l (my plan)
S52 pistons 86.5 and m47 crank 87 mm 2.05l
S50 pistons and m44 crank 1.9l
S52 pistons and m44 crank 1.95l
Thereabouts!
Hartge even made a 88 mm crank.
Heaps of possible combinations and the parts are relatively inexpensive.
But the compression ratio goes up depending on combo you use.
So no more unleaded for these engines and straight to 96 or 98 octane.
Don't know what your octane rating the fuel you use is?
Any way my engine is in bits still getting bored and pistons decked crank key way cut.
Can't wait till it's done, but I'm working on my head, port and polishing.
What will drive me mental though is the afm, it will restrict me badly.
That's what I'm upto here in oz. but there are heaps of engine builds going on around here!
Some are even using s50 throttle bodies.