[Raptor450]

You'll regret it later but here goes: Toomey B1 pipe kit with filter & jet ($360), Vito's reed spacer ($60), Vito's timing degree key ($20), better reeds (like Boyesen or Vito's)($60), shave the head down about .030"($40), get the Vito's 240 kit($?), and get it ported($200). You could always get a stroker but then you start really losing reliability for trail riding. All the mods listed above should keep it fairly reliable if they are installed correctly and you take care of it. The 240 kit will not blow up in a week if it is installed properly, you mix your fuel/oil correctly, and don't over-rev the engine for long periods.

With these mods you may be even with a stock 400EX if you're lucky. My buddy had half of these mods on his Blaster and he still could not beat a stock Warrior. But he didn't have the 2 most powerful mods - the 240 kit and the port work. Don't expect to "smoke" or "blow past" anybody with a Blaster.