The AC Schnitzer ACS 99d is a very interesting piece of machinery and a very impressive idea but let’s face it, it doesn’t cut the mustard.

Us folks interested in proper roadsters like the BMW Z4 are more likely to appreciate a proper sports car engine than the diesel one in that.

BMW’s turbocharged 3.0 liter straight six cylinder at the top of the Z4 range is the object of this tuning kit AC Schnitzer have cooked up.

The 306 horsepower and 295 lb-ft of torque version gets tuned up to 360 horsepower and a 383 lb-ft of torque so you know the N54 powerplant is ringed all the way up.

Well, not all the way up since the same basic engine can go from 340 hp and 331 lb-ft in the S version gets pushed up to 380 hp and the same kind of torque.

Alongside the performance upgrades, the BMW Z4 also gets a revised body kit from AC Schnitzer. There are some aesthetic changes but the most important role they play is in improving the handling.

Also offering the same blend between looks and a technical use we find the new alloy wheels and the performance tires that are wrapped around it.

The alloys are available in sizes ranging from 18 to 20 inches, serve up various styles and will all make sure you feel every bump in the road.

Dislocating your kidneys doesn’t sound like too much fun but driving one of these AC Schnitzer prepped BMW Z4s actually is.

Well, on smooth roads at least.