Just so you know the springs are different from the SLK and the SRT models. I believe the SRT6 springs are stiffer and they are the ones we are known to shorten. Steve knows more about the stocker slk springs so I will let him chime in on what is available.

Removing the Resonator is removing the 20-25lbs of middle silencer housing and replacing with straight pipe. It frees up some weight and make a nice little growl a bit meaner. cheers