I have the Banks Economind, what they call stage III. Purchased ~April 2009, installed ~ July 2009. (it has the cold air box + red intake horn + bigger intercooler + cat back exhaust + blue economind tuner. I got the optional display module, can't remember what it's called, they have since come out with a bigger better one. )
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Honestly I haven't driven the truck very much since installing the Banks. ~ 1000 miles total. Overall very happy with everything. It all installed per the instructions, and I didn't encounter any of "this doesn't fit right" etc. The engine personality changes noticeably on the different power settings- I think there is a setting for economy, and one for "same as stock", then 3 or 4 more which add power. Given that mine is a 48RE auto and bone stock, I don't play much with added power levels. And since I haven't driven the truck much since installing, I can't make any testimonials for fuel consumption etc. The main attraction for installing the Banks stuff was to get a bigger intercooler. I have seen opinions both ways on whether an upgraded intercooler actually lowers EGTs. My 0. 02 from direct observation is yes it does make a significant difference. In my case I have both pre-turbo and post-turbo EGT gauges that were installed long before the Banks stuff was (ISSPRO from Genos).
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Bottom line- I have had good luck w/ Banks. I am not affiliated with them in any way, not married to anybody's sister etc. What appealed to me about Banks was their pitch (and what I've seen in TV shows touring facilities etc. ) about the extended engineering they do for safety and longevity etc. The Banks kit I bought has its own independent thermocouple which must be installed at a given location in the exhaust manifold.
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From what I have read, it's possible to get the same or more HP increase for less $ by using a product other than Banks. So if bang for the buck is absolute decision maker, then Banks may not be your choice. I have also read on here criticism of Banks for not well supporting old product. I can't offer first-hand info on that. Personally I have been happy with the quality and ease of install "as described" and support I have had from Banks. I did encounter one "issue", not resolved yet, but frankly I'm not sure that it's a Banks issue either. The "issue" is: Among its safety components, the Banks unit watches some combination of engine RPM and vehicle speed etc. and makes some calculation to look for transmission slip. What happens is- the Banks unit regularly detects what it thinks is trans slip, and gives the warning on the Banks display. Maybe the Banks unit is hyper-sensitive to detecting slip, or maybe my trans is really slipping, I dunno. And again, I haven't driven the truck very much since installing the Banks stuff, so I haven't had much opportunity to work with it. What I do know is-
[1]The slip detection happens about 25% of the time- maybe one out of 4 trips.
[2]It seems to happen vast majority of time at low speeds, as in starting from a dead stop and in 1st & 2nd gear.
[3]It seems to happen more if I drive more gently- as in very gentle accel. It seems to happen less if I drive normally- that is, not jackrabbit starts or 25 lb boost coming away from stoplight, but get my foot into it quickly and use at least 8-10lb boost.
[4]The trans operation feels totally fine to me and didn't change when the Banks was installed. Before receiving the warning from the Banks box, I never had any feeling of "gee, feels like that was slipping".
[5]There is a re-set procedure I can go through to clear the slip code, but even if I don't do that, it will typically clear itself after a few minutes on the highway. I wonder if this may be an OBDII code that has been happening all along, doesn't set the orange light, and I only became aware of it after I installed the Banks monitor.
[6]My truck has done some (light compared to most of you) towing- 7K, and has 39K miles, has had gentle treatment and has had trans fluid change, but I have not yet adjusted the 1st gear band. Part of me wonders if that might be contributing to the cause of the slip detection, so I am cautious about beating Banks up for this. At this point the ball is in my court and has been for many months. Truck runs and drives fine, and the condition often corrects itself, so I haven't been too worried about it.
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As my sig indicates (and I added that some time ago after seeing Banks get beat up elsewhere)... I am overall very happy with the Banks stuff.