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How much horsepower will stainless steal headers cat back exhaust and a cold air intake add to b18?

Stainless Steel Headers: 10-15 horsepower

Cat-Back Exhaust: 5-10 horsepower

Cold Air Intake: 5-10 horsepower

Total: 20-35 horsepower

Please note that these are just estimates and actual gains may vary depending on the specific components used and the car's overall condition.