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Anytime you remove a restriction on a turbocharged car, you get improved spool, better throttle response, a better top end, etc. All benefits. Whether it's catless or a high-flow cat, they are better than stock period. Is it noticeable between the two, absolutely.
But these gains do normalize within a couple of days. Meaning on back to back testing spool improves when going catted to catless. I do this yearly to smog one of my cars. But within a couple days, I forget all about it.
As for the smell, it's not that bad at all. This of course is subjective. I've been driving catless cars of some type for more than 10yrs. Under most situations you don't notice anything. But exhaust leaks can leak into the cabin, or a breeze that blows exhaust back towards your windows or vents.
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