For years, it has been a common belief that all catalytic converters place a choke-hold on performance. In 1993, Random Technology disproved that theory with the introduction of Super High Flow catalytic converters. Direct-fit, bolt-in Super High Flow converters are available for most vehicles. This design, which meets Federal EPA and California ARB requirements, enables virtually any vehicle with a properly tuned engine to meet emissions standards with little, if any power loss (compared to an exhaust with no catalytic converter) In fact, Random Technology catalytic converters actually have a higher flow capacity than most mufflers. As an example, a 3" diameter Super High Flow converter flows 501cfm. Most 3" diameter high performance mufflers flow less than 475 cfm at the same test pressure. Random Technology direct fit Super High Flow catalytic converters are now available for most domestic and imported vehicles. Custom catalytic converters with inlets and outlet up to 4" in diameter are available. Independent testing by engine builders, racers, and automotive magazines has repeatedly proven the superiority of the Random Technology Super High Flow design. Sold in pairs. Installation kit is not included.