Using this muffler, our team found that our car's performance has improved significantly. The sound that it PRODUCES is deep and aggressive - just what we wanted .We also noticed that our car is now more fuel-efficient than before and we feel that it’s because of the better flow of exhaust gases. The installation was easy too! The only downside is that it's a bit pricey compared to other mufflers, but for the performance gains it's worth it. We`re more than satisfied with this automotive product!