while SuperPro is aimed towards performance
Ideal for both aluminum heads to cast iron blocks and aluminum heads to aluminum blocks
superior finish
The Forced Performance high quality silicone inlet system for the FP FA20 Blue Turbocharger includes everything you need to connect your turbo to most aftermarket intakes
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