I bought an 07 Raptor 350 this year, my first toy. Its been great but I could use some more speed/power/torque. Im new to all this but Ive been looking into the HMF sport slip on exhaust and add the powerbomb header. Or the stage 3 DG Xccelerator http://cgi.ebay.com/ebaymotors...QrdZ1QQsspagenameZWD1V Either with a jet kit.

Ive also been looking into the Pro Design K&N air filter kit?
And a front 12-tooth front sprocket and leaving the rear stock?
And I bought a skid plate kit with A-arm guards and plan on getting a swingarm plate. I ride on a track that also has wood trails, little creeks, and sand dunes.

 

My advice: get the HMF slip-on, don't get the powerbomb header, don't get the DG, get the K&N, install the skidplates. The 12 tooth is going to take away from your top speed. It will add to your acceleration. With the mods you listed, I always like the 350 with a 14 tooth front sprocket. The 350 already has plenty of low end grunt, but it's all in what you want.

 

full exhaust system, good air filter, jets, and stage 1 hotcam

 

A full exhaust system is not necesary on a 350. I did a lot of research on this when I did my last rebuild. The factory headpipe is just as good if not better than some of the aftermarket brands. This applies only to the Raptor 350/Warrior. I don't really care if you get one, I'm just trying to help you save some money.