[BR Duke]

Installed 3" High Flow Cats and 3" Full Flow Mufflers ( 3" X 20") on RT/10. It now has the backpressure of stock taken care of, but the resonance is too much. Any suggestions on a good sound with no resonance? What direction to go from this point?

 

[TOOOFST]

Are the mufflers at the back end and cats in sills,then it would be the muffler type or location,my corsa system doesn't have any Res.

 

[plumcrazy]

my high flow cats and x-pipe muffler delete has none as well.

 

[BR Duke]

I did not install x-pipe, this could be part of my problem.

 

[BR Duke]

I had 3" SS Vortex installed near the end of the run. They seem to work very well.