You won't be the fastest driver on the freeway, but we easily maintained speeds of 70 mph to 80 mph. (cnet.com)
It flows a minimum of 30 percent more than the factory system and provides a noticeable seat - of - the pants improvement in acceleration and ability to maintain speed on grades. (fourwheeler.com)
My car maintains speed for 4 or 5 seconds when releasing gas pedal, then the speed starts dropping slowly. (mechanics.stackexchange.com)