The 2.5 has a different header. You will need to get a side mount exhaust header. I replaced an original pro .15 on mine. Which was a direct drop in.

Im drawing a blank on the 2.5, i need to look at a friends. I believe the clutch assembly is the same on the 2.5 (almost positive) .

Pull your c-clip, Off will come your clutch bell, Then you pull your shoes and spring, Then im fuzzy here but i believe the clutch bell shaft/nut holds on your flywheel. The flywheel is a tapered fit on the shaft off your motor, Pressed on by the clutch bell shaft/nut.

The shaft/nut is only like 3/16 deep maybe a tad more( the shaft is longer, but the nut on the end of the shaft) . Hence the need to cut the shaft down on the new motor. When you break it down and compare it, you will see it clearly.

Hope that wasnt to confusing, cuz i think i am now lol :stupid:
Ignore my typo's i hunt and peck real fast :