For the record, we at HGW, like all SC shops, provide Mag with a spec sheet stating what mods have been done to a vehicle---prior to ordering the SC.
Mag then does the calibration required for that particualr application. On minor mods, like headers and air intakes, the ECU will adjust for those changes.
Mag does provide a fairly conservative tune--the Hummer still runs like a rocket after install. Mag does not squeeze every last once of power that the engine can produce with the SC installed because they have a warranty to maintain. They make the engine run great, but not a peak performance.
At HGW, we rely on the tune provided because we too want our clients to have the best trade off between performance and relaibality. We have people here in NJ that will do the dyno pulls and make the necessary adjustments for a "custom tune." However, we will not warranty our install after such a tune. Let the guy who did the custom tune, stand behind it. There are many of these guys, few are good at what they do.
Remember the stock 6.0 can only handle about 500-525 HP to begin with. To get more, you need to beef up a lot of engine components. Now, we WILL do that if you want and make your Hummer sing--but to squeeze a few extra HP out of a stock block is a waste of money and a lot of risk.
Fubar--as you know---something was wrong with the Mag or the install. There was no need for a custom radiator or twin fans, etc. on a basic SC install.
If I had your Hummer, I would reinstall the SC from page one---we have talked about this. Since Towbin and others have already lead you down a path of fans and radiators, there is little turning back.
Once your heads are fixed, I hope your problem goes away. Keep calling a you need so your Hummer gets back on the road.
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