What are your experiences with these mods and having error code issues or smog test issues after install? Cargraphic, Tubi, Milltek, Speedart, Fabspeed cat bypass. I am so lost...don't know which to go with or if it will sound gross.

 

FVD bypass pipes and zero issues here.

 

i had the fabspeed bypasses(still have them) and the truck sounds like it should have from the factory. I installed the cargraphic for a lil more rumble now.

no problems either way