These BBK direct replacement 1996-98 Mustang H-pipes feature 2.5″ diameter CNC mandrel bent aluminized tubing to ensure maximum flow and horsepower.These BBK direct replacement 1996-98 Mustang H-pipes feature 2.5″ diameter CNC mandrel bent aluminized tubing to ensure maximum flow and horsepower. OEM-Original O2 sensor locations and factory style die-stamped flanges ensure a perfect fit. BBK In-house dyno-testing has shown solid gains of 15-20 horsepower depending on application. BBK full length H-pipes are designed as direct bolt on to factory headers or any aftermarket shorty headers as well as, of course, BBK shorty headers for weekend track or race use. Each BBK H-pipe offers performance, quality and value that guarantees years of top performance for your Ford Mustang. *Please note: BBK or Any of its Distributors – CANNOT SELL THIS PART TO ANY END USER WITHIN CALIFORNIA. THIS PART CANNOT BE SOLD OR INSTALLED ON ANY POLLUTION CONTROLLED VEHICLES IN CALIFORNIA. IT IS FOR OFF ROAD USE ONLY IN THE OTHER 49 STATES ONLY¿ NOT INTENDED FOR USE ON PUBLIC ROADS OR HIGHWAYS IN THE OTHER 49 STATES – FOR RACE USE ONLY! *These High Performance pipes are NOT EPA Street Legal in any state.