Well what dynomax did you get the ultraflow or superturbo.
I have the ultraflow(2.5) in place of my res and a Magnaflow in the rear. It droons but the radio has to be very low or off. Did i notice a differnce, yes i did. With 3 simple mods i gained 13hp. KKM, Ultraflow in place or res, And a Magnaflow muffler in the rear and yes i have the dyno to prove this.
