The GSC Power-Division S1 cams for the Mitsu Evolution X are designed for those with the stock turbo up to the 550hp range These cams will not sacrifice any bottom end loss over stock cams; nothing but gains and will promote faster spooling of the upgraded turbos. Gains of 20-50whp (depending on Turbo) have been seen by simply bolting the S1 cams in. 

• Designed for a rev range of 3000-7500rpms
• the S1 cams work well on the stock valve springs.

The GSC Power-Division S2 cams for the Mitsu Evolution X are designed for those with 600HP+ in mind. Gains of 40-80whp (depending on Turbo) have been seen by simply bolting the S2 cams in. 

• Designed for a rev range of 3800-8500rpms,

• The S2 cams require an upgraded valve spring.