I have a 98 hx and I just upgraded to the 4-hole injector. I haven't had time to run many miles under controlled circumstances, but my car really snaps to a start and runs really good. I did a couple of 36 mile runs today and got 58mpg @ 65mph on split 60/40 freeway/rural. Setup just about like yours with exhaust system and headers. I need a few tanks to evaluate further. Good Luck
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