Closed Deck EJ257 V4 Ultra Short Block Forester 5i long-runner intake manifolds with

5i long-runner intake manifolds with no additional adapters

The Killer B Motorsport Air/Oil Separator is a product that you

larger internal fillet and reinforced skirt

5:1 for those with higher boost pressures and the desire to drop the compression ratio a little

reducing oil consumption and improving power potential

Closed Deck EJ257 V4 Ultra Short Block Forester 5i long-runner intake manifolds withThis closed deck block design has been proven to withstand extreme boost levels resulting in high cylinder pressures without the worry of cracking a sleeve. The billet material that reinforces the combustion area has been further optimized with our V4 closed deck block in the known problem areas making it a far superior product to any sleeved block. With a closed deck block the stock sleeves are still in place eliminating all risk of dropping sleeves