People are confusing redline and rev limit.
Redline is the beginning of the red mark on the tachometer. It is for visual purposes only to let you know you are coming to the end of the RPM range in the current gear and is time to shift. It can be shown at 6K, 7K or whatever, it is just there for visual purposes only. There is also a shift light on the Si, although, not sure exactly at what RPM that starts at.
Rev limit is the max the computer will let the engine rev to while going up gears. Getting to that point you will see the needel bouncing and you gaining no speed.
OP you have something wrong if it does not go past 7K, unless your gauge cluster got messed up in the accident and is reading incorrectly.
If gauge cluster is tested to be fine, then you have another mechanical issue.
Anyway, if the car's rev limit was set at 8200 RPM then there is no reason to not go to that when getting on it.
