Collector reducer? Why?
Nascar runs a pinched collector that opens back up. Maybe velocity? also running 3" exhaust the back is near impossible on some cars.....The farther you are from the engine, the cooler the exhaust and the 'smaller' it is to the pipes due to contraction of the hot expanded gasses getting cooler.
Nascar runs a pinched collector that opens back up. Maybe velocity? also running 3" exhaust the back is near impossible on some cars.....The farther you are from the engine, the cooler the exhaust and the 'smaller' it is to the pipes due to contraction of the hot expanded gasses getting cooler.
