Hey so im considering doing these mods but im happy with the mileage im getting...around 19mpg, will they drop my mileage if im driving the same as I do now?

 

The drop if any would be negligible. If it is, the point of the deckplate is that you can screw it back on! I really think the ISR is a waste of time, and probably wont help, but deckplate seems like it makes sense

 

I have the DeckPlate mod open; and with tight throttle cables, i hear it purrrrrr..

 

truthfully, they're both pointless..Deckplate mod is cool I guess, it's what seems to be everyone's first mod. Brings in a little more airflow. ISR mod just makes the deckplate mod sound louder or cooler, whatever you wanna call it. If you have time to kill and you just really want to do something to your truck, cool.. go for it. If not, then I wouldn't even worry bout it.

 

FWIW, I have read a gain of ~8 HP at the wheels on a Mustang Dyno.