Before, I thought you meant you had a 4th gen S model w/ F22a, but now I understand you have base 5th gen. Sorry I misunderstood. A base model is not a type s as you are saying though. Type S Preludes are found in Japan. It has an H22, as does every 5th gen, but it has a differences such as 11.0. compression ratio, different intake, slightly different exhaust manifold, and I belive they recieved a port & polish at the factory. The throttle body was bored out a little bit too. The engine puts out 220 hp instead of 200. There are more differences, but you're right, I am putting to much time into it.