Tomei Right Hand Exhaust Cam Gear for WRX STI EJ255 EJ257 Single AVCS 152013

The angle that the stock cams are clocked to when installed at the stock location on factory cam gears not always the most effective for making power with aftermarket cams. Aftermarket cams with more aggressive lift and duration often need to be dialed in at a specific angle to optimize the powerband for your setup. Adjustable Cam Gears are important when installing cams as they allow you to dial in the cam degree for optimum performance.
The exhaust side valve timing can be adjusted, and the intakes avcs system can can be optimized. 

Super lightweight, precision, ultra durable, simple scales for adjustments, and performance use and showroom finish.