Thats all they do. I will tell you at least from my experience though depending on what you do with exhaust you may want them back so keep them around. I went with catless mid pipe and muffler deletes and I took the tube out to quiet the cabin after that.
Brembo Pkg, Paxton SC, ID1000's, JMS BAP, Boss IM, JLT CAI, Lund Tuned, Tremec T56 swap, Black Pype Bombs, Pypes LT Headers H-Pipe, McLeod RXT Twin Clutch & LW Flywheel. Alum. DS, MGW Shifter, BMR adj. Panhard, UCA & LCA's, Eibach Pro Damper, Sportline Springs, MMD Louvers, Roush splitters, RTR decklid and surround, CDC Grille, Staggered 20" ACE Alloy Driven, Trufiber Hood.