Here is what my air fuel ratio looked like stock vs. using the Spintech muffler and I let the computer acclimate to the Spintech muffler for ~150-200 miles. Right after I put the stock exhaust back on and drove for about 10 miles the air fuel ratio went leaner.
Spintech air fuel vs. stock
Vanityplates has TRD headers and a dual exhaust and his looked better but he also drove his truck for many more miles with his modifications than I did. As soon as he removed the air filter though his air fuel ratio went super rich and he lost power.
Vanityplates air fuel ratio
Here is what every other truck looked like there with similar OBD2 emissions and catalytic converters.
Typical American truck
You think the v6 air fuel ratio would read the same
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stock exhaust
Formerly Modified JBA headers now SSautochrome headers temporarily
TRD LSD
Extang lift off tonneau
Hankook DynaPro AS RH03
stock air filter & box
220 HP @ 4800 RPM
302 TQ @ 3400 RPM Run With Spintech Sportsman XL muffler, stock air filter, and JBA headers
208 HP @ 4800 RPM
285 TQ @ 3400 RPM Run With Spintech Sportsman XL muffler, TRD air filter, and stock manifolds
204 HP @ 4800 RPM
271 TQ @ 3400 RPM Bone stock
Quarter mile 15.526 @ 87.17 mph bone stock in 40-degree weather 2WD SR5 V8.
Quarter mile 15.389 @ 88.66 mph modified in 60-degree weather 2WD SR5 V8.
0-60 IN 6.88 seconds on G-tech
Dyno run results click here
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