once more bolt ons start being produced, 20hp should be pretty easy. I guess.
Intake, exhaust, headers.
The headers on my last car (acura tl-s) gave me 33hp alone!
2006 325i Sparkling Graphite Metallic-Black Leatherette
Navigation-Bmw Assist Automatic-Xenons Carbon Fiber Front Lips-Aluminum Pedals Power/heated Front Seats
5% Tint all around 30% On windshield all the way down