on my 4.o i cut off the flange after the cat and ran 2.5" tubing all the way to the 3" inlet for the flow 40. right now it is dumped but i plan on welding up some pipes that exit infront of the pass. tire. the flow is si (3")/do(2.5"). right now it sounds great, nice and very deep at low rpm's and i was surprised that there was only a very slight loss in lower end torque (but the bigger pipe made up for it every where else). and i found that from that stock flange back to the muffler the pipe was 2" OD. everyone else here seems to have 2.25" stock...huh
2000 Ranger XLT 4X4
custom fabbed skid plate
fairly stock, but not for long, looking into:
Flowmaster 40 dual, MT classic 2, 33's and bl, misc. exploder accs., custom box/sub/ amp setup...