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If you've got a custom exhaust, the best and easiest way is to have the exhaust shop install O2 (oxygen sensor) bungs in the places you're most interested in taking measurements.

MTX-L PLUS Reading:Idle: 22.4Cruise: 20.1WOT: 15.1 The first test was to fail the gasket in the exhaust collector. In many aftermarket applications, the O2 sensor is mounted behind a collector gasket.