So I ordered IDP's FICM tuner before the 4th of July so it would show up while I had some time off of work to mess with it. I bought the whole tuner to keep. It showed up and I tuned my FICM. There was definitely a noticeable difference in power running it with the SRL. It had more low end throttle response and more smooth, linear power throughout the whole RPM range. I was impressed greatly.
Well, the truck had been very smokey lately and knowing how the SRL is, it was way to much smoke. So I investigated on my time off. The drivers side up pipe flex joint was leaking. I proceeded to tear it all apart and cut out the bellow and welded in a piece of flex pipe I got at the auto parts store. Couldn't get it to line back up for the life of me and it was Sunday and I had to be back on the pipeline Monday morning.
Parked the truck, drove the TDI around the right-of-way for a week. Ordered a y-pipe from Tousely Ford and put it on the next Saturday evening after getting back home from work. Truck is now amazing. Boosts very quickly like it should, pulls harder throughout the whole rpm range, smoother, better throttle response and better mileage.
I also now knew I had some stiction going on. The FICM tune uncovered it. Thank you Ford for masking problems with tuning until they are so bad you can't affordably fix it. I went out and got some T6 and changed the oil (always ran plain 15w 40). Still had slight stiction. Ordered some Archoil9100, added it, and no more stiction. T6 is definitely worth it too. So much smoother and quieter idle, and easier starting.
I drive about 1000 miles a week following the pipelines around north central PA and have got 21.2 mpg two separate times on the same trip into work and back to where I stay during the week. 17 mpg the one time and 15 mpg another time after letting the truck idle a lot to run the AC while I sat in it most of the day.
Anyways, I am definitely impressed with IDP's FICM tune. I bought it because it was cheaper and I really didn't foresee myself changing FICM tunes all the time like I could have done with PHP's. I figured I would just stick with one all the time making the rest I paid the extra for useless. It's worth it for those looking at IDP vs PHP.
So, to sum it up, T6, FICM tune, non leaking up pipe,
all combined equals more power, better mileage, and a 6.0 that is even more fun to drive. IDP tune did what they said it would.
Oh, and I'm getting that good of mileage rolling around leveled on 305/70s. I drive slow, no faster than 65 highway.