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It has very little to do with the exhaust system and much to do with the mechanics of the engine. All modern muscle cars have aluminium blocks (vs cast iron), round exhaust ports (vs rectangle), and completely different timing set ups than 60s cars have. The firing order makes a big difference because nobody fires 2 in a row on the same side of the engine ...


With the check engine light on, the car is going to be running a fixed set of parameters from the Engine Control Module. For instance Fuel Pressure will be held at max pressure and timing and spark adjustments (if done electronically) will not retard or advance. One of the reasons this happens is because the Engine Control Module is not recieving all of ...

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