i have recently done a muffler delete but after reading more i would like to straightpipe it , does that include removing the resonator and cats? or just cats? and i read i can put a build ur own dual actuated exhaust kit so i can open and close the valves when needed, Could this work? and any recommendations for springs? i was looking at sport ones that lower 1.4inches theres alot of room i can lower.. Thanks !