i have a blueflame 100cell cat with 3" downpipe.
i cant really tell you how much of a difference the cat made as when i fitted it i also fitted a k03s turbo at the same time. but im sure it helps alot
ko3s is already on my leon cupra. not keen on the revo software tbh either, seems to boost hungry. prefer the cc stuff, a lot more progressive than agressive! would prob go aftermarket gt turbo if i decide to put big power up her tho! just looking at all the options.
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