I need help I just bought some TSP long tube headers for my ws6 from a private seller how can i know there true 1 7/8 and not 1 3/4? Where or how can I measure the primary to see if it's actually 1 7/8, does anyone have pics?

 

Get a hold of a caliper and measure for yourself. If your motor mounts are aged, I recommend getting a set of poly motor mounts to install while you are at it as that should help with fitment.

 

All tubing is measured from the outside. Get a set of dial calipers preferably digital and measure the outside diameter on a straight run of the tubing, the bends will be distorted somewhat. It should read around 1.875 if they are 1 7/8, 1 3/4 should be 1.750.

 

As a after thought, Harbor freight has a decent digital dial caliper that will more than suffice for this job for Cheap!!