First off, I want to say thanks for the responses to my question on the P/S noise. I will see what another dealer has to say. My next question would be since I am a new truck owner, I would like to add duel exhaust to my 5.4 L 2003 Supercrew F-150. What kind off exhaust manifolds and exhaust would be the best? Are there other upgrades to the engine that I should consider. It is a 4X2 truck so I would like it to be a little faster on the street, sound better, but still be legal to run (California). Thanks