Ya, the Raptor is supposed to come with a piggyback tuned for a 2.5. You really shouldn't need to exchange out any of your internals for that kinda boost as far as I've seen. Unless you just wanted to put them in now, so that they'll already be there when you crank it up later. Look around on RS25 if you haven't already, I'd say you'll have better luck there as far as getting information. Look at Skidd's and Spudchucker's threads. There's a lot of good back and forth of people asking questions and getting real answers.