I cant speak to Hemifevers tunes because Ive never tried them, but I received a Superchips Flashpaq 3840 as a gift last year and I love it.

I get 2-3MPG better on the 87 Octane Mileage tune and I see a noticeable performance increase and throttle response gain on the 91 octane performance tune.

You can adjust the TC lockup so that it doesn't occur until around 50MPH whereas with the deathflash it locks around 40mph and castrates the truck and you pretty much have to floor it to get it to pop out of OD.

They also have excellent customer service. Received a less than 24 hour response to a problem I had (On a weekend).

Just my 2 cents.

(ANYTHING is better than the death flash).

 

The 40mph TC lockup drives me nuts! It makes like the truck has no ***** at all when cruising and you need to speed up.

 

It also removes what I believe is called torque management, which is responsible for you having to nearly floor the pedal to get it to pop out of OD A quick little tap and she pops out.

Hemi's tuner does this as well I am told.

 

I thouroughly enjoy 3rd gear lock up without having to hit the o/d button

 

I know what I'm getting for christmas. My boss used to work for SCT, so i get dealer price.