took mine in as the exhaust had a rattle in it - they replaced the actuator springs following the tsb and it still rattled, found a bent valve - ended up replacing the entire exhaust even the tips - the rattle is gone and the exhaust note sounds better than it did before, quiet is really really quiet now and baja sounds better - tried to get the last portion of the old exhaust to put on my yet to be picked up R order as I heard they are a direct fit and then bypass the R resonators just before the tips on the R, they said they have to send the entire old exhaust back to Ford