proper exaust diameter
 

86 4runner, 22re w/tri-y header, looking at replacing everything from header back, not sure if want to get after market kit or have it made, unsure of size, should i go 2 1/4 or 2 1/2 tubing, will orobally go with cherybomb muffler since its simple and straight thru, keeping it out of the way

2-1/4 will be plenty.