[Treeve]

The 5 speed is a lot lighter.

The only difference in ratios is 5/6th vs 5th. 1-4 are all the same. From memory, 5th is .83 and 6th is .61, whereas 5th is .72 in a T5.

I've changed the tail housing on mine so the gear lever is in the right place for my car (Dax Rush). So I've got a ford body and a holden tail housing, which moved the lever back by a couple of inches. In a cobra you'll want to move them forward, so the TKO boxes are good for this.