WHAT ARE THE BEST MUFFLERS TO RACE WITH INTO THE TEN AND NINE SECOND RANGE IM GOING WITH A 3.5 X PIPE SETUP WITH DOWN SPOUTS BEFORE REAR AXLE. IM LOOKING AT GOING WITH THE SPINTECH SPORTSMAN STREET XL 3.5 INCH MUFFLERS, I HEARD THESE ARE RESTRICTIVE BUT SPINTECH'S WEBSITE SHOWS THE FLOW THE BEST OUT OF EVERYONE ELSE. NEED SOME OPINIONS ON THIS. THE CAR I'M BUILDING IS MY 70 GP SHOULD BE IN THE TENS ON MOTOR.
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