Our Subaru boxer engines kill our spool up time, most notably because of the very long pre-turbo exhaust tract(exhaust manifold, up pipe). To directly combat this loss of spool up we will port and polish all 8 inlets/outlets of your 3 piece exhaust manifold. We enlarge each port to match up with the stock subaru gaskets, porting 6-7mm of material at the entrance/outlet of each port and then tapering down into the port. This takes out the large steps in flow and smoothes out the port to port connections. Every piece is perfect matched to eachother for optimal flow.

As far as gains, 3rd party Subaru SVX owners have seen ~15 whp/wtq gains, most notably in the low and mid range. You should also expect to see quicker spool up time.

In turbo applications, you may need to tighten your turbo waste gate arm because of the higher flow. Start by tightening the wastegate one full turn and then test where you are at. Repeat if necessary.

We also offer an optional Ceramic Coating that help combat underhood temps, prolong the life of the manifold, and will also keep the exhaust gasses hotter which in turn speeds up velocity. Coated INSIDE and OUTSIDE if you choose to get it coated. The pictures of the manifold that is uncoated on the inside is just to show you what the PnP looks like.

We can also tap the exhaust manifold for your aftermarket EGT Gauge.

Recap

• Creates an optimal flow path for the exhaust gas
• Expect gains in the 10-15 whp and wtq
• Coating allows for higher gas velocity which speeds up turbo spool
• Entire powerband shifts to the left
• Optional Ceramic Coating
• Keep the stock look for emissions
• Gain hp/tq without having to lose that boxer rumble(unlike equal length headers)