Quote: You would be better off to use a vac pump on the street... with a exhaust system it would have to be a VERY low restriction to allow a header vac to work
i am planning on running a evac system as i had the tubes welded into my 2" tti's already.. I plan on going 3.5" exhaust with dynomax bullets..
I dont recall what the restriction is on all of the assorted muffs but the lower the restriction the better the evac will work. A evac will pull about 5" hg max and for every in hg that your exhaust has it will lower the evac value