and the smaller primary size will enhance the low and mid throtle TQ for street duty.
Very good point Ron, I definately side with this as the larger tube headers and heck even just a 3" downpipe with manifolds will lose low end torque at light throttle conditions IE driving around town in traffic which everyone likely does more than any other driving condtion. Larger tubes will help top end undoubtedley but you have to weigh gains to losses. You get what you pay for, I refuse to install Pacesetters because they are a very poor header. The holes in the flanges for the exhaust ports arent even lined up to the heads properly!!! This problem is somewhat hidden because of the large tube diameter but the problem is still there. Even the coated headers arent the nicest coating and will still rust out pretty quick. Like I tell anyone else, you can always save longer and buy something that isnt garbage.