The British engineering firm's new retro-fit cylinder head ... of these parameters, the kit opens the door to what could be the ultimate air cooled 911 engine. Porsche designed 964 and 993 ...

UK-based EV-conversion specialist Fellten offers a bespoke kit for the 964 generation Porsche 911. The kit doesn't require any modifications to the car and it's fully reversible. The cost of the ...

After the drama and excitement of the extravagant R8, the 911 seems conservative and restrained. But as ever with Porsche ... features a modified cylinder head, new intake and exhaust manifolds ...

Not that you have a choice of how many bhp you would like from Porsche ... £137,529 911 Sport Classic and features a carbonfibre airbox, tweaked engine management, new cylinder heads and ...