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My understanding is that Blacktrax will not put the ECS before the cat because they don't want to have to hassle modifying the header to get the ECS to fit.
If you get pulled over here in the Bay Area and they find you don't have a cat, you are going to get a big fine.
The ECS after a high flow cat would be the way to go.
By the way, what have you done about the secondary O2 sensor???
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