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Originally posted by combustion gsr do you have an exhaust ? if so mine sounded much better with the header
Aftermarket headershave thinner walls versus stock, so it will make your car slightly louder. For reasons unknownst to me, my exhaust also sounded better after I installed my header. Optimal exhaust gas velocity = improved sound?
Since virtually all aftermarket header applications are tubular opposed to the OEM cast iron header piece, there will be a minimal sound change due to the thinner wall like someone said eariler. You won't notice it enough to be bothersome.