"Thanks for your very well engineered and high quality products...The sound is perfect for my vehicle (not too loud & very mellow) and I couldn't be happier. However, I'm most impressed with the quality of your product and how well it's engineered. Being an engineer myself I really appreciate a product that does what it's supposed to do and installs with minimal problems. Your system was simple to install. Once I removed the old nuts and O2 sensor, your system was a simple bolt on installation. I greatly appreciate the attention to detail your engineering staff has paid to the design of the overall system. The product is manufactured in such a high quality manner that the muffler and pipes were so nice looking I almost hated to put them under the truck! ... I know I'll enjoy having it on my truck and I look forward to years of trouble free service."