I currently have the Rousch cat back exhaust on my 2013 f150 EcoBoost and find it too aggressive if I were to swap to the eco sleeper can I buy just the resenator and muffler and what’s the price.
That would likely not work, since the Roush system has different dimensions for its muffler and inlet tubing. Your better bet would be to have a universal resonator cut and welded in.