my dad's got a 2000 expedition 425 with 27 inch itp mudlites on it. he's wanting a serious mud quad, and he's definately planning on a lift kit. but he also wants engine performance. since polaris discontinued the expedition, there's not a huge market for performance parts. im wondering if anyone knows about any good websites for things like pipes and jet kits or if anyone has the same quad with any work done. any help would be greatly appreciated and thanx.