I need to replace the Cat-Back exhaust on my '94 Blazer 4WD 2 -Door. Any one out there want to recommend the best way to go? So far I can go stock for about $100, or DYNOMAX muffler/tailpipe for about $50 more, and the dynomax is still 2 1/4 pipe. What is the difference between the 2- and 4-door tailpipe? Could I just cut off a 4 door pipe and then go 2 1/2"?