Quote:
Originally Posted by Xinshadow
Just a guess, but probably because a catted UEL generates less power overall? Which probably means less interest from buyers. Plus I'd imagine most people with catted headers don't get a tune to preserve the warranty/emissions as much as possible. I went with a catless UEL and tune specifically because I wanted to make more use able power.
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The high flow spun metallic cats are not very restrictive IMO. They will still make good numbers. I have a catted UEL here, has never been tested or posted about, weren't sure if we wanted to pursue them. The cat required for it is more expensive than the one used in the EL header, the runner layout is also quite a bit different than our non catted UEL. There's also no absolute guarantee that you won't eventually throw a CEL on stock tune nor pass emissions in places like California. Basically we weren't sure if the price increase could be justified with the only guarantee being maybe passing a visual inspection and reducing noise/rasp.