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No, no catalyst is free-flowing if it is doing its job. About 80% of total system backpressure is from the production catalyst. That's why your cat-back exhaust systems only make minor differences in power (10-15 bhp). The Mopar cat-back and most other 2.5" systems are more than sufficient to fully realize the power stated in the upgrade kits. We haven't found any delta from a well-made 2.5" to a 3", so we are selling a 2.5" system. It's lighter, so you'll be faster - right?
Race pipes are almost guaranteed to get you in trouble if you use them on the street because how loud they are - unless you are sneaky. I leave the stock muffler on even when I install the race pipe for trips down the strip and other sorts of power-rewarding activities. So there you have it, my solution to mid-14s.
I've said similar things here ->
http://www.ptcruiserlinks.com/forum/...17&whichpage=2
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That is why I like the ATP down pipe. You can swap out the CAT with their test pipe in 5 minutes. A larger CAT is sill restrictive ,but, it is going to flow better than the stock CAT.
Thanks 3Bar, you don't realize how much I worship you
mich_132003, yes there are a lot of downpipe w/ highflow cats assemblies out there, I think I called everyone and no one seems to gives a rats a$$ about the PT. None,so far, will just bolt up. scottmech is making one though, but I won't be able to swap out the cat easily. Unfortunately, my problem is I want the best of both worlds. I am just going to have to fab the missing link from the ATP to the 2.25 or 2.5 cat back.
Just to let you know there is a company out there that is coming out with some bolt on performance that will give us 350 streetable HP and up to 500 not so streetable HP and reliable. We all may want to wait about 90 days.