i have a 1999 ram 1500 sport with the 5.9. i just put a cat back on it and it was so quiet that i removed the muffler (flowmaster 40 series) and just ran pipe and no muffler, and now its throaty, but still not loud(even for being straight pipes). this thing has a cat on it that is 12k old, it was replaced under warranty at the dealer because it was plugged. the original one was one pipe into it and one pipe out of it. the new one is two in and one out. and it seems like it has so much restriction(obvious from lack of noise) and it takes hills like crap now. any one know how to remedy the problem? or is there infact a problem?