Chrome Stacks

[farmaller]

I had 5 inch dual stacks on my flatbed and the only problem I had with them was with glass packs there was more noise in the cab and more vibration, the vibration might have been partly caused by the fact the 5 inch stacks slid over the 2.5 inch stacks I originaly had put on the truck.
I did have the same vibration increase when I put a straight pipe on my Freightliner with a 3406 Cat egine.