I had a stock N/A BF XR6 clutch in my car for freaking ages, I'd estimate they are good for maybe 230rwkw or so in a boxcar - mine slipped on decent boost in third with 370rwhp but was good in first and second.
I murdered third in a T5 with about 270rwhp, at the actual time it broke it was only maybe a 60 or 70% 2-3 shift, I wasn't even going hard. The box I put in after that lasted through powercruise, (and copped it a fair bit) but by the end of that was noisy in every gear except 4th and all the synchros were pretty shagged. If you have nice short diff gears and/or slippery tyres under the bum they will last a little longer.
I've been raping the T56 since august last year with 370 and then almost 400rwhp and it's still sucking it up like a two dollar hooker. I luff it
