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You only need to remove the exhaust muffler, it is held in with one bolt size 7. This also works on any tune, stock carb, dual carb and racing carb. And no you don't need to re-tune the engine you are correct. You will gain 6HP with the stock carb and 3HP with both the dual and racing carbs.So if I'm understanding this correctly, the best power is achieved by removing the exhaust from the racing carb setup? Is this the exhaust pipe only? And wouldn't you need to retune the car to run without an exhaust?