Here’s my best shot. I make the right amout of power at the right RPMs, but i make more torque than the original (though at the right RPMs as well). And since you can never have too much torque, that’s actually ok with me 
4.9L XP V8 BMW M5 E39Rev0.lua (44.3 KB)
Nice one! So far I’ve build the E34 straight six and the E92 V8. A nice collection of NA ///M engines is starting to form 
E92 4.0LRev0.lua (49.6 KB)
E34 3.8LRev0.lua (44 KB)
heres my go at S54B32, got the power right, but lacking a bit on torque
///M POWER <3
S54B32Rev0.lua (47.9 KB)