[V8] What size is the exhaust pipe after the cats (4.2)

[NIck Miller]

Check out this section here of jegs :
Jegs Exhaust <http://www.jegs.com/c/Exhaust/10245/10002/-1>

I'd go with 2.5's. would want it bigger, not smaller, than your overall
diamater.  Also, why not gett a nice 3in system with good cats instead of
E-cuts (which are notorious for leaking) and actually increase the
performance/mileage all the time?

If not, Couplers/reducers are a good solution.