maybe the MAC "high flow" cats aren't as high flow as they are supposed to be. Why are you changing over to cats? For emissions? I have swapped out a set of high flow cats for my off road before, and it wasn't that bad. I think they are bbk or something. But it did make it a bit quieter. I should be back in cali in about a month or two, I hope to see you at carlsbad when I get back to the states. Later, -Chris
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331 10:1, AFR 185's, TFS-R intake
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