If I put a wiseco stock bore 11:1 piston in my ex, am I going to have true 11:1 compression. I heard about some compression problems but I didn't know if it was in the bigger bores?

 

I've been reading that most of the 11:1 Raptor pistons are actually 10.75:1. Wiseco would clear this up for you though for your EX. The only problems I see are making sure you have good enough gas that won't rattle with that C/R. Compression is where power is made, really wakes 'em up!