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paimon.soror in my X4 M40i i tested the same map with stock and catless downpipe and there was definitely a difference in every possible way.
Heck, I even ran an X4 M40i with JB4 on stock cats vs Catless no tune in my car and we were the same.
As far as it looks, Catless is definitely our biggest bottle neck
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60-130mph 6.5s X4M #HCP
60-130mph 5.0s G80 M3 #OrlandoAutowerks Sauce
IG: @bmwF9XG80
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