Originally Posted by brains06
Ok thats the info I was looking for. So you didnt notice much of a difference between no cat and the cheap one or between the cheap one and the magnaflows? I still have the stock muffler on do you think that will help me maintain enough backpressure?
Since my truck already had dual flowmasters on it with no cats, adding a single cat helped increase the backpressure and I definitely felt a difference. Going from one cat to a true dual set up with 2 cats wasn't much of a difference. If you have a stock muffler which is pretty restrictive, going from no cat to a single cat won't be as big of a difference. If you went from your current set up to a single cat or even dual, with a better flowing muffler, you'd be best off.