Cummins Isx Turbo Nuts. on 2040-parts.com

Porsche Boxster S Black Edition (2011) at 2011 Geneva motor show

Another week, and rather than just another Porsche, it’s another Black Edition Porsche special – this is the Porsche Boxster S Black Edition. There’s more power and more standard kit, but the price is higher too. Just 987 will ever be built, in a nod to Porsche’s internal numerical designation for the Boxster.

Volvo gives T6 engine the Polestar treatment

Just weeks after announcing its Polestar performance kits for the T5-engined cars, Volvo is now offering packages for the XC60, S60 and XC70 models fitted with its turbocharged six-cylinder engine. The T6 Polestar software package adds 25 hp and 30 lb-ft of torque, bringing totals to 325 hp and 355 lb-ft, respectively. Volvo says the added power won't result in greater fuel consumption, as the tuning of the engine only increases power when needed--though we'd imagine most drivers will feel the need often enough to significantly affect mileage.

Saleen S5S Raptor

By Liz Turner Motor Shows 20 March 2008 21:13 Saleen is best known for its red-hot Mustangs, but at New York it revealed an American supercar concept to rival the Europeans. Its S5S Raptor is around the same size as a Ferrari 430, and should be close to the same price, but boasts 175bhp more. It’s powered by a Saleen-built supercharged 6.0-litre V8, that will run on ethanol (like an increasing number of race cars).