the way i understand and the way my cage is the kicker bars are over my subframe conectors i dont think they have to be physicaly connected to the subframe . i never heard of the 30 degree thing in the kicker bars.
Well, you said "roll cage" so I assume you mean you have a "full" cage which includes the forward roof bars and windshield bar. If this is the case and you will be going for an NHRA cage certification then you should weld the kicker bars directly to your subframe connectors (going through the floor). The subframe connectors need to be a specific size also, depending on whether they are square or round so be aware of that specification.
On the other hand, if you really meant a "roll bar" and not cage then you can weld the kicker bars anywhere you like.
If you have an actual frame the main hoop must be welded to it and in that case you do not need the kicker bars. It's only when the main hoop is welded to plates on the floor that you need the kicker bars welded to the subframes.
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