I was told to use a crayon to mark the collector extensions and run the car several runs and to cut the collector off where it melts the crayon shruggy
I've never done that but every Mopar, stick or automatic car, I've added collector length to went faster and quicker so test, test and test some more wrench up twocents

Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)