Running a sensor in the exhaust stream without having it powered will shorten it's life as will leaded fuel or installing it too close to a turbo as it is sensitive to heat.
My belief is that a wide band setup is MANDATORY for an engine with a power adder. You might get a custom tune, but no engine's components do not degrade with time or use.
Blow just ONE headgasket or worse and you'll gladly pay the tariff for the protection a wide band setup offers.:hihi:
'95 Ranger 5.0 GT40X Tri-y GT40 Intake S-Trim Snow Stage 2 Lowered Baer Racing Brakes Viper Spec Tremec w/Hurst shifter Custom Interior Dakota Digital Dash Corbeau Toplines OZ Racing AM/FM/Mp3/CD/DVD/TV.
2014 GTIG 5.0 Vert Base. Sil Carb Fiber dash. Bama Race Tune. Gibson axle backs. STEEDA Springs KONI STR.T Adj. Panhard. Dynamatted. Audiocontrol LC8i Amps and Sub! Leather OEM seats. Custom Badging.