Skunk2 Racing Pro Series XP Valve Spring Set (311-05-7350) Prop_65_(C the rear exhaust alone offers

the rear exhaust alone offers a subtle upgrade while maintaining OEM valve functionality

This muffler is considered an "S-Type" muffler when compared to the 401158 and used on the same application

Perhaps the best feature about this intercooler system is that it maintains cooling efficiency as more power producing upgrades are added to your Porsche 997

spring-loaded T-bolt clamps and heavy-duty

6061-T6 billet aluminum

Skunk2 Racing Pro Series XP Valve Spring Set (311-05-7350) Prop_65_(C the rear exhaust alone offersSeat Pressure: 93 lbs at 1. 320in. Open Pressure: 238 lbs at . 820in. Coil Bind: . 718in. Must Use Skunk2 P N: 312 05 0015 (Spring Bases) to Install in H22A F20B Engines. Skunk2 is proud to introduce its Pro Series XP (Extra Pressure) Racing Valve Spring Kits for the Honda B series VTEC engines. Each kit includes Skunk2's high quality race proven dual valve springs that are the result of nearly two decades of racing and engine building experience.