hfc
 

What is the benefit of adding hfc on my stillen exhaust? Sound, hp?

+HP & +Sound.

^^^Exactly what he said.


For future reference and so a dead horse is not beaten to death many times over. Please take the time to read, search and do your due diligence as a responsible forum member. As more than likely, what your asking has been asked many times over.

With all the cars I've owned, I've joined the forum for said car. I usually lurk for a couple months. Read what has already been asked. Read the FAQ. Read others experiences and DIYs. Then when absolutely could not find what is asked. Then I start a thread.:tup:

lighter than stock, still able to pass emissions?