The upper was decent however the lower was near identical to a Truck lower which killed the flow with out some major work. The Holley SysteMAX took the Vortech style and design and made it work much better, they fixed the small issue with the upper and made the lower killer.
i have a vortech and the lower has been ported.i dont know how it would match up against other aftermarket intakes but it was a major improvement over stock