Saltillo Express
Senior Member
anybody on here catless without a tune? using the plug fowlers as spacers?
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I think a full open exhaust like that without a tune and the loss of back pressure will hurt your power gain on one end?Non foulers are hit and miss...sometimes they work, sometimes they dont. Just curious, but why are you wanting to remove the cats? If you are looking for power, the tuner should come before anything else anyways.
anybody on here catless without a tune? using the plug fowlers as spacers?
I've been running them for a little over a month now. Haven't thrown a code for the cats once since putting them on the on. But I do keep throwing codes for the sensors in front of the cats.
That's weird. Think it's related?
Many of the 4th gens have been getting a P0133 code when adding longtubes and removing the cats. I have seen a few guys get this with stock manifolds and removed cats, and others have seen it with longtubes without cats. The common denominator is the removal of the cats though, so I do believe that is being triggered by going catless. It is very easy to fix with custom tuning though.
I have a local customer that ran ARH longtubes with cats for almost 2 years...never threw a code. 2 days after cutting his cats out, he got the same P0133 code. I cant answer why that code pops up, but it almost always comes on when the cats are removed.
Simply put, tune first...then remove the cats. (or do both mods at the same time if you can swing it).