We decided to install MBRP's catted H-pipe on Kurt's Pony. The tube (PN S7238409; $1,206.45) is constructed with T-409 stainless and measures 3 inches in diameter (main tube) with a 2.25-inch crossover. Highlighting the H-pipe is a pair of 200-cell, high-flow, metal-matrix catalytic converters. The cats aren't nearly as restrictive as the larger, factory cans. They represent at least a small effort (on the Mustang owner's part) to be in accord with smog laws.