Dunno if this is old news at this point or not, if so just ignore me I found that the snorkel on the airbox has approximately 2" inner diameter, and seems really restrictive to me. So I replaced the snorkel with another Ford Snorkel with approximately 3.25" inner diameter. It was a direct swap, 15 minute job, and best of all.... Cost less than $5 Here's the old airbox snorkel next to the new one After you pop out the old snorkel using a screwdriver and a little brute force, you have this Pop in the new snorkel with a little more brute force Ford P/N 7C3Z-9F721-A cost $4.58 + tax at my local dealer In my opinion, this setup combined with a high flow drop in filter will flow as much as any $200+ CAI on the market. There's really no restriction between the airbox and engine, being that it's all 3.5" although I imagine the airflow is really turbulent, so that's my next mod on the list. Parts ordered, so hopefully next week I'll be posting my $75 Polished intake on a budget build.