Not Ranked
If you really want to improve your exhaust , contact Burns Stainless about their merged collectors . That`s what is on mine now , along with their stainless 5 lb mufflers . Major improvement in the whole rpm range . Talked to Robert Pond who also runs their stuff and with open exhaust on his engine ( 427 in a `67 Fairlane ) , he saw 100 hp increase 0n the dyno . I`m probably in the 75 hp range with mufflers . However , you should probably be seated as they aren`t cheap !
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