If you're going to be doing woods and trail riding, I would start out with just a set of pipes, and a pro-flow filter setup. after that, don't bother dumping any more money into the engine until you've beefed up the suspension. Keep in mind that you can have all the power in the world, but it does you absolutely no good if you can't control it, or get it to the ground. Once you've got a good suspension setup, then I would start looking at doing more performance mods to the engine.