No major engine work. The only major work done has been two clutches. Everything else has been done by myself. I recently bought a 2006 roadster and I honestly think the 2005 coupe is stronger than the 06. I have mods on the 05. No internal engine work ever has been done to the engine. I've recently check the compression and it was correct, vacuum check and it check fine. Fuel pressure is fine. If you have seen, I have a thread in ref to the misfires at high speeds. I have not posted the resolution yet, but I think I have found the problem and when I get it fixed I will post it to the thread.