it probably be still the same cuz the restrictions is still there,
you only got space on the testpipe, then after that air is still choked by the rest of the exhaust pipe
the same can be said for pple that buy 3" exhaust muff's and still has stock exhaust piping
but the testpipe is a good start for your car,
dont forget EMISSIONS, they're somewhat tight in here
where in illinois do you stay at?
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