i made a post a while back because my 3.8 was misfiring under a load and generally running like crap. i tried replacing spark plugs and wires but it was still messed up. per advice from this forum i replaced the cat today and its running 100% better. i think the new pipe was a magnaflow? not sure, i don't know how to weld so i got one that was the whole frontpipe without that weird bend for the o2 sensor. i kinda had to mush the heat shield to get the sensor in on the side but none the less its runnin good. thanks guys
