I have an ef4 and a forge mbc, the two have different size barb's for the vac line, what is the best way to make sure my vac line will not come off? I tries zip ties on the turbo outlet and they just are not tight enough.

 

You can take safety wire wrap it around twice then twist it up tight. Make sure you bend the wire over against itself so it doesn't leave a sharp wire sticking out to get cut on.