Quote:
Originally Posted by steve99
If you get way worse fuel economy after installing header, cgeck your ltft if its running high like 10% or npre especially at lower. \rpm, you likely jave amd exhaust leak. Generally this wil caise o2 sensor to see fresh air so ecu tginks car is rin ing lean so ot add lots of fiel via high positive ltft.
And dont ise o2 sensor spacers when you have tune, and never put spacer or adapter in front o2 sensor, ive had seceral cars turn up from exhaist shop installs with spacer in front 02 it thows fueling way off.
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Is it OK if there is a bung extension for the rear O2 Sensor?