The lovers of all things BMW, BimmerFile, have learned that BMW Performance will be offering an output upgrade for the N54 twin-turbo found under the hood of the BMW 135 and the 335. The N54 is the popular 3.0L twin-turbocharged inline 6-cylinder engine that BMW says produces 300-hp (on the stateside).

The new BWW Performance Power Kit will offer a software and performance upgrade that will give the N54 a boost of 20-hp. In European terms that means the engine will now produce 326-hp and 450 Newton meters of torque. In the U.S. that translates to around 321-hp and 336 lb-ft.

The kit has yet to be made official for the U.S. but we have been hearing for sometime now that we can expect a BMW Performance Power Kit sometime in April.

You can check out a video and the high-res image gallery of the BMW Performance 1-Series and 3-Series after the jump.

BMW Performance Parts for 1-Series and 3-Series:

BMW Performance Parts for 1-Series and 3-Series Video:

Source: BimmerFile