[THEFERMANATOR]

With a long exhaust like on a motorhome, you don't need a big muffler to keep it quiet. I persoanlly would run a single 3" exhaust out the back on something like that, and run a MAGNAFLOW RV style muffler(large round style instead of oval). MAGNAFLOW gives a good bit of sound reduction, but with no backpressure. The 3" pipe will keep some backpressure and improve your bottom end and maintain some milage. Also run a good quality filter in it, but be careful of K&N's. They are known to slime over the mass air flow sensor in a chevy and cause reduced milage and power. Also run AC DELCO platinum plugs ONLY, and make sure the cap and rotor as well as the wires are good. Don't know how many miles she has on her, but if your close to 50 or 60K with that many years on it it wouldn't be a bad idea to do a full tune-up with a fuel filter. And there are also a few tuners out there that will work on that engine if you want to add some extra OOMPH. And also don't expect alot for milage out of it. The 454 is a good engine, but it is like the old OMC 235 in MANY ways. It will run for a long time if you take care of it and run here easy, but she shore do like her gas. Also take good care of that transmission, a 4L80E can get you for a $1K REAL quick if you don't take care of it either.