I dont think the sr head flows better. I want to see some kind of test proving this. Just saying. plus ka has a better valve train. I think its almost like oranges to tangerins, not apples to oranges. The biggest issue is probably the legality if it is your street car, with the ka you just throw your stock stuff back on, with the sr, you have to store a ka in your yard/ garage/ bedroom wherever just incase you get popped.
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