Billet Main Crankcase Breather Adapter Fitting 3-8" NPT Turbo Oiling the not-equal length exhaust manifold

the not-equal length exhaust manifold can lead the efficiency of other cylinders

This closed deck block design has been proven to withstand extreme boost levels resulting in high cylinder pressures without the worry of cracking a sleeve

Bottom line is this - if you're rebuilding a Subaru engine then you're going to want these bolts

no questions asked

Bolts with a proper 17mm hex head on it

Billet Main Crankcase Breather Adapter Fitting 3-8" NPT Turbo Oiling the not-equal length exhaust manifoldThe Outfront Motorsports press in billet aluminum main crankcase breather fitting is a great way to adapt the standard tune to a barb or AN fitting. This version adapts to 3 8 NPT for easy adaptation to the fitting style you need. 100% made in the USA.