Was thinkin if anyone can help me out. Wat's the diff between a USDM 2.5 STi short block VS a Jap 2.5 NA short block. If I was to use the USDM pistons and rods on the NA block, will the strength and performance be the same? I've heard from others that both the short block are diff. Just wan to know the diff before I start on my next project Thanks in advance.