QUESTION: Are you currently running your exhaust with or without cats? If you are using your cats, your exhaust should give you worry free use for about 4-5 yrs. Without the cats, the packing material burns up really quick (in about 1-2 years). I have done extensive research into the Supertrapp exhaust and why they stopped making it. Since I installed my Supertrapp system about 2 months ago, I had the same questions and asked many people around town. According to the muffler shop that installed my exhaust, (Cohen Muffler, San Fernando, CA), the system is about the best you can go with for our 3 ltr engines, as far as sound resonance and overall performance, however, once the packing material begins to age, the system begins to lose air flow capability. Symptoms of a clogged exhaust include backfiring, hesitation through your RPM's and WATCH YOUR OIL PRESSURE GAUGE!! Once the exhaust get clogged, the pressure will go through the roof and more than likely you'll just blow an engine gasket (if your lucky) or cause severe engine block damage!!!! Be careful and enjoy your exhaust.. Now, if you want to keep your exhaust, just order some replacement mufflers. I believe I have the number around somewhere where you can get new Supertrapps. Just take them to a muffler shop and have them weld them in place of your old ones!!!