Wich gearbox to use?

[Mathias]

Hi there! I´m looking for answers regarding wich gearbox to use in my 03. I drive a type 4, 2,5 litre, aprox 160bhp. Up to now I´we been using the original wich works fine for race, but a longer fourth or a fifth would be nice on the highway. I´we got the tip on using a 912 gearbox, wich cars used ths?

Thanx in advance