I have Flowmaster super 40's SI/DO. Im wanting a better sound and maybe possibley more power. Im thinking high flow cats...anyone do this...how much did it cost to instal and was it hard to get someone to do it and how is the sound? Also, should I maybe get rid of the flowmasters? Cuz I heard a lot of people saying Flows arent good?

 

put a maghnaflow on and notice you gain back ure low end tq people claim that the flows don't lose