i have a fairly stock engine, i dont like to tell whats under the hood at all, but i want to know would i be better off getting just a set of ls6 heads, what would be the power increase and would it be cheaper to just get the ls6 heads now and then get them ported later, or get the ls1 heads ported now, and does anybody know the flow numbers on the stock ls6 vs a set of mti stage 2 because i might just get the ls6's first and get them ported later down the road