Is it only when you let off a high rev? If so, this is typical when a cat
back is added. Unignited fuel is ignited in the manifolds by small glowing
burrs and goes away after the burrs have worse away. Your cat is easy to
check, simply jack it up and hit it a couple times. If it sounds like a box
of chicklets, its bad. Typically, a bad cat would produce noticeable power
and fuel mileage decreases, as well a limit high revving.
the high flow cat helps the flow alot. it also adds to the tone and
sound of ur engine. my brother has a high flow cat 2 1/2 in. piping
and a flomaster mufler on his 91 z24 3.1FI and that thing sounds
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