Originally Posted by Staples

I don't think your car would have leaned out that bad from your mods. I've seen the Stillen G3s cause the car to lean a little, but not enough to warrant detonation, at least not to the point of the engine going kaboom.

Were you able to look under the car at all? It could be a hole in the block, oil pan, or your oil filter came loose from not correctly tightening. You also said you were low on oil, did you do your own oil change and use a new copper gasket and make sure the drain plug was properly tightened?

Good luck.