Outer Limits 4x4 Board

Had the misfortune of removing the exhaust on a jackaroo using a rock. The section where it comes down from the turbo and bolts to the front of the muffler is needing replacement. Was going to do anyway as it was hanging low after the bodylift. I have decided to replace the whole system, has anyone done this and is there any point going to a sports system. Looking around the patrol guys say 2.5in for the 4.2td however the landrover guys are saying 3.0in for the 300tdi. Not to worried about noise and any more power would be a bonus. thanks in advance.

Have a 2.5 exhaust on my td jack, has improved performance a little bit but i did because i knew i would also snag it.