depends on what year truck u have,my 92 V8 has a O2 sensor before the cat so
it only reads what is comin out of the exhuast manifolds and not after the
cat, i cut mine out and mine runs fine, gettin 15 mpg and that is what i got
before, if u have a stock muffler on there it wont be loud that much but a
noticeable difference, u put a cheery bomb on like me and u will set car
alarms off.
Joe
92 5.2 3.55sg 4x4
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