Can I ask if you are having issues with the current coils?
With all of my years around LS engines, the stock coils are the best hands down. If they aren't giving you any problems, do no change them. They can go 200-300k miles easy without a hiccup.
Techron is a fuel injection cleaner and my point is it won't help prevent carbon build up on your intake valves. I am not aware of any product that can prevent carbon build up on a DI engine.
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