Stage 1 heads feature extensive port work on the intake and exhaust. We utilize stock valves and springs which are inspected and tested to meet factory specifications.

The cylinders heads are responsible for getting air into your cylinders. To make big power you needs lots of airflow without compromising velocity.

The cylinders heads are responsible for getting air into your cylinders. To make big power you needs lots of airflow without compromising velocity.Our cylinder heads will outflow the stock heads by as much as 40% while maintaining enough velocity at both high and low rpms to provide substantial torque and power increases

Stage 4 heads are the best flowing cylinder heads you can buy for your Altima or Maxima. They feature 1mm oversize stainless Ferrea valves with the Ferrea race spring and titanium retainer package.

ARP L19 headstus for the VQ35 are the best studs available without expensive machine work required for using even larger diameter studs.

Every SFR intake manifold comes with provisions for the stock components. We can weld bungs and fittings for direct vacuum connections,MAT sensors,etc...... for FI vehicles.