IAG Performance 1150 Series High Compression Closed Deck EJ25 Short Block 2006-2014 WRX / 2004-2021 STI / 2004-2013 Forester XT / 2005-2009 Legacy GT Super Pro-InStock Built to improve exhaust flow

Built to improve exhaust flow

This results in more consistent downforce and improved aerodynamic efficiency

providing a more comfortable driving experience during daily commutes or spirited drives

45mm emission surface

IAG Performance 1150 Series High Compression Closed Deck EJ25 Short Block 2006-2014 WRX / 2004-2021 STI / 2004-2013 Forester XT / 2005-2009 Legacy GT Super Pro-InStock Built to improve exhaust flowDesigned for high octane fuels such as E85 and race gas, the IAG 1150 High Compression Short Block is engineered to dominate on the drag strip while remaining suitable for street use. Optimized for high horsepower applications, this short block increases compression and strengthens the engine to handle the most demanding performance builds. Compared to the standard 1150 Short Block, the high compression version raises the compression ratio to 9. 9: 1