OK, I removed stock exhaust from my 09 street glide and put on Kuryakyn Crusher true duals and put back the Screamin Eagle slip on's. Everything was tight and no leaks at the manifold upon initial start up. I let the bike run in the shop for a few and took it out for a short ride. After about a half mile the engine started to vibrate violently. I shut the bike down while rolling to rule out a drive line issue. Got the bike home and removed the duals and put the stock back on and bike is back to normal with no vibrations. I bought the bike used last year and have had no issues. I got the Screamin Eagle race tuner with the bike. Is this just a issue that the bike needs to be re flashed? Any advise (besides why would I change out stock exhaust) would definitely help. Thank you and ride hard-ride fast!!