[Formulajones]

I had hooker 1 5/8 4 tubes on my stock 70 RAIII bird and raced it for a while that way. Went back to the RA exhaust manifolds years ago and have raced it extensively that way. Never changed the exhaust system just added the mandrel bent down pipes

The car never ran a tenth or two either way depending on the DA. So it was a wash for me but we're talking about a car that's completely stock, only 400 cubes, and only runs bottom 13's with a best corrected 12.76. maybe a bigger engine with more HP might see a different outcome but that's not what determines the choice for me. It all depends on what the goals are for the car.