Standard cat will be a little restrictive. If you want to be legal you will get the same gains from a sports cat but they make slightly less noise. I love a decat but they are illegal but i took the risk.
Milltek isnt too bad tbh, but my old piper with a decat was booming through the car.
You will probably get 2-3 hp more with decat as a guess, you would probably need a remap to get the most out of it. N/A cars need a little back pressure from the exhaust so if your chasing power the sports cat will be better.
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