After 3 years of owning my 2014 diesel Cruze (with ZERO problems BTW after 71,000 miles) I finally got the nerve to dump the DPF, SCR, DEF and EGR system. On anything 50 HP over stock or less it has zero noticeable smoke or exhaust emissions. 50-65 over stock just a slight haze until the turbo fully spools. 65+ is where it starts to get fun, lol. Its nice to not be limited to the seriously restricted DPF. Will be taking it to the track soon.