My F150 (2004) 4x4 V8 new body is plain noisy since I installed the Troyer purchased AF1 intake and Magnaflo exhaust. With any acceleration higher than a gentle throttle, it ROARS. with a disticnt "waaapp", or rasping. I think it is the intake and is probably due to intake airflow rate. Could it also be an exhaust roar? Sometimes if I push it harder, there is a noticible vibration on the floor also. Anyone have advive on how to quite the rasping noise without removing the AF1 intake?