Hi there,
The O2 sensor can go anywhere up stream of the cat converter, when a down stream )2 sensor is fitted as well this is only for diagnostics purposes. The headers will give a small increase in power and engine response as the exhaust gas flows is a lot smoother and volumetric effeminacy is improved.
Mark (mhpautos)
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Thursday, September 4th, 2008 AT 5:08 AM