4" stock mufler inlet?

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I just climbed under my truck to see how long of a peice of 3" pipe I needed to replace the "cat",and noticed the "cat" has a 4" outlet and the muffler has a 4" inlet. Someone told me to just go to a muffler shop and get a 3" peice of pipe but how can that work?Does someone sell reducers 4"-3"?HELP!!!

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1997 2500 4x4,Auto,Cal. e. g. r. (for now),3. 54's,Amsoil throughout,DiPricol egt/trans temp/boost gauges,ready for more power

 

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Got mine from NAPA before I went 4" all the way.

 

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NAPA sells all the pipe,reducers and clamps you need. I did mine for under $25

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95' 25004X4,AT,Driftwood,Banks,Warn fender flairs and running boards(Play truck)95 3500,5 speed,driftwood,Banks&phscotty,34,000 GCVW apple and tractor hauler(work truck)

 

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I got mine a few years back, when my exhaust was 2" smaller than it now is, at the local heavy duty truck parts show. In stock, cheap, what more can you ask for?... ... 6" anyone?

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Chris Timochko
1997 5sp 4X4, HX40, BD 4" Brake, Marine Compression, Custom Tuned Injection Pump, 370B Injection Nozzles, Delivery Valves, Governor & AFC Spring Kit, Psychotty Air, Water Injection, NOS Diesel Kit, 6" Chrome Exhaust System, No Smoke Valet Switch, McLeod Dual Disc Clutch, Mag-Hytec Rear Cover, Cummins Chrome Kit, Optima Red Tops, Hadley Bully Horns, Hurst Line Loc, Goodyear Wrangler AT/S 305/70/16s. Test mule for Auto Wurks Diesel race program