I have under my Opel Corsa C a sport exhaust with twin tailpipes of Novus, the roars pretty. This cheap Chinese-tuning toy brings absolutely no hissing or whistling sound, which is similar to a turbocharger. For me, does that sound more as if something had broken. Apart from the fact that the hiss produced in a real turbocharger only during switching. But all is not as bad as the previous reviews are not very promising and also the price is very low.
