I dunno if this works in a -4 line but could use a pen cap. Done it before but not sure what the line size was. Is at least a free way to experiment and see if that truly is what you need. Some people use old nitrous jets as well.
I use a -3 line with a ebay oil flange with the restrictor built in and a -10 return. car smoke slightly when I first hammer it on hard acceleration (just a few seconds) but I believe thats my piston rings not turbo oil. LOL car did it before turbo install.
A forum community dedicated to Ford Mustang owners and enthusiasts. Come join the discussion about performance, production numbers, VIN decoders, modifications, troubleshooting, power adders, DIY tutorials, and more!