That was actually a question i was going to ask so now i know thank you. I was leaning towards the xe274 myself but hope i wont have to change springs or anything. With the xe268 i was worried about to much pressure so i feel the xe274 or the lunati would solve that. I do like the xe274 amd the lunati i just want best bang out of this engine. I will be cruising but will probably be doing some agressive cruising with some track time