software upgrade?
Basically doesn't matter when you chip. The mods you mention will maximize the benefits..
For instance, FMIC will result in a lower temp being recognized at the manifold temp sensor. This provides major input to the ECU. Lower temps means more timing can be advanced.
TTDA, Better air flow, higher MAF signal...ECU will adapt fueling to the new reality via that signal and the downstream 02 readings...
Once chipped, there's nothing really you can "Tune" except to optimize all the inputs.
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The consequences of that are pretty big ($$$ wise)
The clamp is not THAT tough to get on...
Reach down there with your left hand, a stubby ratchet and a 7mm socket. Tighten it. That's it. As mike pointed out though, sine the clamp is not even on the hose, you're gona have to pop it off again to slip the clamp on.....



