Mercedes is upgrading the SL with new V6 and V8 engines and revisions to the V12. The SL500 now has a 383bhp 5.5-litre V8 that helps drop the 0-62mph sprint to 5.4sec. The new V6 in the SL350 rustles up 268bhp.
The Porsche 911 GT3 now laps as fast as Ford’s Mustang GTD, thanks to new Manthey upgrade
An uprated aero, suspension and brake package from Manthey Racing has made the 992.2 GT3 just as quick as a Mustang GTD around the Nürburgring, with n…