Make sure you go to a reputable Revo dealer (one that will check the car over properly before and after).
May be worth installing a panel filter and removing the exhaust pre-cat to get the best gains. An accurate Dyno will give you around 245bhp, a generous Dyno will give you 250+bhp with the mods I've suggested.
Just make sure you've replaced your Cam follower and PCV, and your car is well maintained
Plenty of reviews out there. Try the review section or google it