The $15 dollar speed pros are what they are, excellent stock dish type replacements. Nothing "cheap" about paying $120 for a set of pistons. I'd go for the flat tops they are around $30 each or $240 a set, which again is not cheap in the sense of the word. You are just paying for the different shape of the top, not that the metal is different on them or anything. FWIW, Im going with Speed Pro hypers in my N/A setup even though I could spend more on the Trick Flows that are cut for my heads I'd rather have the tighter tolerances of the hypers, cost aside. The stock hypers in my snake have had no problems with boost. I'm all for spending the money where it's needed but in you case what is needed happens to be cheaper.