I was going to keep everything stock, but now that an engine rebuild is on the horizon, I'm thinking of going further to make it worth it. Living in California, I've come to the conclusion (for now anyway) that keeping the exhaust stock is the best option for me. With that in mind, what is the limit? Could I still go with an 18t, or does that require a downside change? Would all this work be for naught if I were to keep the exhaust stock?
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