Twin turbo c5

I've been running my 80mm turbo fairmont for awhile with a straight down pipe but I'm wanting to do a full exhaust and test a few different mufflers I have laying around . Is there a way I can test the difference in backpressure in the mufflers . If so what do I need?

conor.davis

iTrader: (20)

Need an o2 bung and a vacuume gauge that threads in there, shops use them all the time to test for clogged cats