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that afr is perfectly fine for na on a stock ecu, fuel is not going to rob you of HP unless your just dumping fuel in, or not giving it any. dumping fuel in is like 8:1 and lower. Not enough fuel is like 19:1 and higher. Its not your fuel pump, its working fine. Don't swap your old one on, rollhard is smoking crack.
3" exhaust generally is to big for na but if you search around you will see that you will not loose power with it on the KA's, there are many dyno's proving this. Timing will affect your power. You did the right thing by check and reseting your timing.
This is why you don't listen to people of the forums. Read, Read, Read. Take efi101. If you plan on going turbo your on the right track. Don't even listen to me go find a good tuning book and read for yourself. same goes for you rollhard, go read how a fuel system works and stfu.
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