A lot of the power gain you feel at 3000 rpm is the computer allowing the CMCV plates (charge motion control valve = butterflies in the intake runner that vary the intake flow at different times in the rpm range) to open fully and the engine starts to breath fully. A popular mod to mustang 5.4 3v's is to install CMCV delete plates that do away with the CMCV butterflies and open the intake runners completely...supposedly good for 15-20hp...the bad thing is that the power gain shows up at 5700rpm and up...a stock F150 engine shuts down at 5300 and a Troyer tuned engine shuts down at 5700 so the delete plates don't work for F150 unless you build the bottom end strong enough to handle the added rpm like a mustang engine... Mike Troyer of Troyer Performance ( the Mecca of F150 performance) said they tried everything they could to make use of the delete mod but it just works too high for a stock truck. So for now enjoy the knowledge of why the sudden power surge at 3000-3500...
The stock intake entry is 2" round, but widens out to 2" x 4.5". I replaced the first section with 3" PVC from Home Depot to allow more airflow. I shaped it just a little with a jig saw to fit perfect then a little sanding and black spray paint. Let me know what you think. It feels like it has a little more power, but it may just be in my head. I have had the K&N filter for a month. Hoping it improves my mpg. Total cost of this project $11.00.
This is the stock setup. The piece just under the radiator reservoir hose is the one being replaced.
This is the 3" PVC (7.5" long) to fit into the fender opening.
Nice fit into the fender.
Slip the rubber baffle on (it is a perfect snug fit without hose clamps).
K&N, intake mod.
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