HMMMMM. Mine only has a flat flange. No tube inside. But it seems to me that if the stock O gasket fits over it then it is smaller than the exhaust port you have on the head. Compare the hole on the NCY gasket that you have. Do you have a weld on the outside of your header? If not I can not advise you on how far you should take it as I have nothing to compare to. Can you take a close up picture? Or maybe xlint could advise. Is it the actual header pipe that goes through the flange?
@bear. YES. It does make quite a difference. My exhaust thumps after doing this. It only makes sense. If you have a 1 inch exhaust port trying to push through a 3/4 inch exhaust flange. You do the math.
__________________
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.
|