I live in missouri and I was wondering how much a Helix flexible upipe is going to affect my emmissions. If it will cause my car to fail an emmissions test how hard would it be to change every time I have the car inspected. I also have a Blitz Nurspec R cat back (I dont think that will have any affect).

 

you will be removing the cat before the turbo, the only reason that cat is there is for cold start emissions, so if your state does cold start emissions then you will fail, i know california doesnt; so you can get away with having an uppipe. you need to do the cel fix though also which is cheap, cause if you have the cel on you automatically fail emissions since nowadays all they do is just plug into your obii and don't really even pop the hood

 

Thanks for the info. Ill look into the cold start emmissions test.

 

not all up-pipes throw a CEL