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You can't replace the airbag comp with an ebay one without getting it coded to the car. Clip won't do this unfortunately. If you have had guys struggle to get in on clip, then it will be causing a back feed and blocking the diagnostics, although i'm sure you can get in to a degree :S. Car will...
I'd be suprised if 5mm more would make much difference, but worth a try. you'd be able to tell if it was choking itself. would it not be easier to get smaller trumpets?
The rear and side rear windows are just glued in place. Have a look at kevs ph1 track car thread. Wouldn't bother unless you were looking at putting in poly carb.