I'm just going through the same problem. That spring you're refering to is an exhaust valve that Suzuki uses to create a louder popping sound. the two tubes are actually cables that run up under the side cover and are operated by an actuator valve. You need to take the cam off and disconnect the cables if you are removing your stock system. They send a cam to replace it. I have bought Cobra dragsters an their instructions say in big bold letters not to rotate the cam or the solenoid, doing so may damage the internal components of the solenoid. I did accidentally move mine and I think I wrecked it. I have a Fi warning and am in the process of trying to correct it. That valve is around $300.00 so be careful with it. Cobra's instructions were very clear I should have been more careful with it.