hocbj23
+1y
Need some input.HOCSDAWG (my truck) has a flowmaster 40 muffler and stainless pipes but I am going to change that.I have to pass emissions inspection annually so I have to keep the cat. My plan is to go 2.25 inch stainless from just below 1st cat,install a free flowing main cat,retain the Flowmaster and split the outlet pipe and make two outlets.Need recommendations for a better free flow ing cat and whether 2.25 inch pipe is big enough or too big. Thanks for the input. BJ