I have the lifetime warranty but have not owned a car I haven't modded. I am wondering if any one knew of higher lift rocker arms for our motors. I saw them for the LS1 engines, they basically increase the lift without changing the Camshaft. I figure that they would have very little chance of finding this during their 5 year inspections, or that it could really cause a warranty problem. Also if I had ported heads and made sure I reinstalled them with stock style head bolts what do you thing the chance of them noticing that would be? Wondering if anyone can think of anything else like this besides the predator. Thanks.