Need some help about my 05 gt exhaust

Discussion in '2005 - 2014 S-197 Mustang -General/Talk-' started by Rideordieford650, Mar 24, 2012.

  1. Ok I was curious my 05 gt has off road x pipe wit slp lm1 before the axle I heard that you lose power and tq is that true and if so can anyone explain to me why? And how much power do you lose Would it be a good idea to get high flow cats? Someone please help

    Please real answers