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I'm looking into cat back exhausts an was thinking of getting the zzp downpipe an a ddmworks high flow cat but worried about smog... I doubt this would pass smog but do I really need both catalyst converters? Would they know it's supose to have 2?

My buddy sent me a link yesterday from Cruztalk.com an someone claims that the diesel oil is better for the motor an turbo then the gas oil an he is in the process of proving it. Have any of you guys heard of this or be willing to try it with your own Sonic? So i put diesel oil in my 1.4T the...