IAG 550 Long Block Engine w/ IAG 550 Heads for 02-14 WRX, 04-21 STI, 04-13 FXT, 05-09 LGT Long Block:2018+ STI RA, 2019+ STI & S209 - PN# IAG-ENG-L550N while SuperPro is aimed towards

while SuperPro is aimed towards performance

superior finish

validated through Computational Fluid Dynamics (CFD) analysis

good heat tolerance and rigidity

IAG 550 Long Block Engine w/ IAG 550 Heads for 02-14 WRX, 04-21 STI, 04-13 FXT, 05-09 LGT Long Block:2018+ STI RA, 2019+ STI & S209 - PN# IAG-ENG-L550N while SuperPro is aimed towardsIAG 550 LONG BLOCK ENGINE WITH IAG 550 HEADS FOR 02 14 WRX, 04 21 STI, 04 13 FXT, 05 09 LGT A "DROP IN" SOLUTION The IAG Performance Hand Built 550 Subaru EJ25 Long Block Packages are a complete, valve cover to valve cover, crate engine. These long block engines offer significant ease of installation for customers seeking a complete "drop in" engine package for their Subaru WRX, STI, Forester XT or Legacy GT. The Long Blocks feature a combination of