Yeah, i'm just saying that with just the little bump in compression from the 20VE pistons, you really aren't going to be putting out that much more power. I drove the piss out of my race car with an Excedy Stage 2 and never did it slip. I just hated the feel of that disc in the end, but it worked fine.
For reference, my setup is a highport DE, SR16VE pistons with larger valve reliefs (11.6:1), ACL race bearings, ARP everywhere, Cometic MLS head gasket, SR16VE N1 water pump, SR20VE oil pump, GSpec underdrive pulley & VE pump spacer, BC Stage 2 cams, adjustable cam gears, stock fuel rail, DET 370cc injectors, Walbro 255HP, generic header, 2.5" straight exhaust, NismotronicSA ECU. Stock MAF, and definitely not maxing it out. Thing absolutely screams.
As long as you have a programmable ECU and can tune for the larger injectors and MAF, they're not going to hurt, but they aren't going to add any power either. I'd spend the money on a basic eBay header long before I'd bother with the MAF. Just my $0.02.