ive got a custom off road pipe for 93-95 f-body.the back flange is factory style the front is like a 2 bolt header flange style.u would have to modify your head pipe & fact cat to this style of 2 bolt flange.once done u can switch between stock cat or off road pipe in 10 min in your driveway.i always found the offroad pipe to be about 1 tenth & 1-2 mph at mission.and when your done racing just take it out!I was figuring on about $30.0.hit me w questions if this piece is unclear{the part that is}.

 

interested shoot me an email s_thabrkay@hotmail.com

 

hey doc i a new to this stuff so any questions just hit me back here or send ME an e-mail.thnks