UrbanRedneck, If you had bothered to read over post#25, on page. 1 of this thread. You would've noticed, that I previously answered your question, however I'll re-post it again anyway.
I did read that and every other post. The impression I got from your post is that you were answering me about the performance difference between no cats and high flow cats, not the actuall gain that either setup would yeild versus the STOCK H pipe.
And I am fully aware of the laws regarding vehicle warranty, but I am also a technician (not Ford), and know full well from things I've seen and heard that they don't always follow the laws. If you don't know any better, they can easily deny warranty work and that's that. But if you DO no the laws, you are right, they have to prove that the modified part caused the malfunction. BUT, if they want to deny the claim, it can become a big headache to fight it to the point of winning, and they can still easily make it a PITA for you before giving in...
Redfire, I wish there was some way to judge car loudness haha. I wish I could have heard your car in person to better judge. I know I like my cars to be pretty loud, but I don't want it to be annoying loud either. My brother has an LS1 Camaro with long tube headers, a huge off-road Y-pipe, and an SLP Loudmouth 2 catback (which is basically one bullet muffler before it splits back into two tailpipes). His car is LOUD, louder than I'd want my car to be. But he also has 65 more cubic inches and about 130 more horsepower than me to.
I'd be happy with it a good bit louder than mine, but not as loud as his. I still want to be able to talk and hear the radio. When I first start my car in the garage in the morning, it is plenty loud. But it sure quiets up a lot once it's warm. My goal is why I considered high flow cats, because I figure it's a step in between, but I don't want to wind up dissapointed either. The reason I haven't relaly considered the MRT H pipe is because it's $500. I found a Bsssanni X for a little over $200 used but now it is no longer available, and like I said, I don't know how an X pipe will sound on this car. I know they make more power than H pipes, but I don't want it to sound like a BMW either.
I suppose I could try out the pypes offroad H and go from there since it is so cheap. But lately I've read a lot of horror stories about it's fitment too, so I don't know what the hell I want to do.
My Dodge pickup that I had before this car was perfect. It had stock exhaust to the cat, then a single
flowmaster 10 series dumped right by the axle. It was just the right loudness and sounded wicked mean. Totally different vehicle, engine, and exhaust system though....