Originally Posted by 06BLK-F150
I have the 3" Air Force 1 on my truck and love it. The moment I put it on my truck I could feel the difference in throttle response. With the 3" AF1 you don't need custom tuning, but if you go with the 3.5" AF1 you'll need custom tuning in order to not run lean.
I'd go with either the AF1 or the S&B intakes. Both are high quality and I have only heard great things from them. I also sell K&N and a few others, if you are set on the K&N.
http://www.modbargains.com/product.aspx?pf_id=AF1_F-150_04-08_MW
http://www.modbargains.com/product.aspx?pf_id=SB_F150_MW
