I understand. If the flange and header are welded on the outside then it seems you could completely remove the sleeve. But I can't say what that will involve. If the whole sleeve is the same size and it fits inside of the stock O gasket , then the whole sleeve is much smaller than you heads exhaust port. The whole sleeve is restrictive. I ( personally ) would do whatever it took to get that whole sleeve out and open the flange to match the inner diameter of the header pipe. That is me though. You have to determine what you are comfortable with.
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MXR TrailBender 160R
SYC Perf head P&P,Matched intake and exhaust, A12 cam, Orange CDI & coil, Motorio pulley, 115mm Variator and lightweight drive face,11gm Sliders, UNI, modded muffler + 200 horsepower 
http://www.youtube.com/watch?v=3hx-hEWl10c
I'll take your insults as compliments and blame it on your lack of intelligence.
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