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I have run NHP headers, mid-pipes with secondary cats, and a sport muffler for 4 years. I use all the O2 sensors but have moved them to the ports before and after the secondary cats on the mid-pipes. You have to extend the cables but I have never got a code because of the cats.
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2003 Black 986. modified for Advanced level HPDE and open track days.
* 3.6L LN block, 06 heads, Carrillo H rods, IDP with 987 intake, Oil mods, LN IMS. * Spec II Clutch, 3.2L S Spec P-P FW. * D2 shocks, GT3 arms & and links, Spacers front and rear * Weight reduced, No carpet, AC deleted, Remote PS pump, PS pump deleted. Recaro Pole position seats, Brey crouse ext. 5 point harness, NHP sport exhaust
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