| All Z1 downpipes also have an additional O2 bung welded in with an included plug. These are intended for use with a wideband O2 sensor during dyno tuning. When we tune cars in house we prefer to actually screw the wideband 02 sensor(s) into the downpipe rather than use the tailpipe sniffer. Of course this provides more accurate results.
Russell Floyd Z1 Motorsports www.300zx.com 1990+ Nissan Z specialists Used Parts, New parts, Service/Repair and Performance Z1 Motorsports Exclusive Parts Line 2877 Carrollton Villa Rica Hwy Carrollton, Ga 30116 770-838-7777 770-832-9253 (fax) 
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