Can anyone confirm that has this system, is it a 3.5" or 4" downpipe?

Thx,
Eric

 

I have the magnaflow 4" system. stainless.

It only has a 3.5" down pipe, and then at the bottom where it angles back toward the rear of the truck, it transitions to a 4" so you can slide the rest of the 4" system in.

 

Silverline, MBRP goes from 3.5 to 4 right at very start of the down pipe by the trubo.

 

magnaflow is a 3.5" dp to a 4" exhaust