My understanding it would pretty much do it to both. The intakes i have done for guys and Guys that have done it themselfs Say It made a difference in over all readings and Idle issues (plugs Loading up) And Racers used to use 3 difference Heat range Plugs The end two (1&6) (2&5) (3&4)is how they paired the Plugs. This was done more by many Racers & mainly for the single carb set-up because of the UnEqual runners. I personaly never ran one of those older intakes.( with the runners)
God doesn't like ugly.
