Brendan Thomas

hey guys,
this is the 1st time i have been on here and i really have no idea what to do, but i am wondering on some things about my ba xr6t, my ba has the 5 speed manual in it (also known as a T5 box) well i have been told that the gear boxes are pretty weak in them and i am looking at working is.
i was told the gear box wouldnt be able to take anything over 240 rear wheel kilowatts i want more!!!

so i was just asking to see if anyone knew of a way of gettin the gear box rebuild or what would be the best way to get the gear box to handle the power??

regards brendan