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Catless alone shouldn't make it loud at all. If you are waking neighbors you probably just have a kleak. Fix the leak and get a tune without the cold start. If you don't have cats you don't need a cold start anyways. You don't need to buy a OFT to get a tune without cold start. I'm sure you can find a member in your area willing to flash a tune for you.
Edit: Nevermind, I see there is more to this car than just being catless. Cold start delete will still make a BIG improvement and worth a try.
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