thats hard to believe. stranger things have happend

 

on my rcsb truck it's just a bolt on 5.3l truck. The exhaust is a hooker aerochamber turned down after the axle.
i have a dmh cutout on it and back to back on several differant times it always runs at least 1 tenth faster with the cutout open vs closed.
it's faster in every area 60 foot included.