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Just had my HKS Ti-exhaust installed. The sound was just amazing. Very deep, yet not loud. Definitely a must own if anything. I was thinking about going with injen, but after carefully considering the built quality and piping diameter, i chose the more expensive HKS because i know their quality is top notch. The owner told me, if you want an exhaust system, do it right the first time around, don't get something you don't like and later change your mind, because its going to cost more to replace the original exhaust. I am very pleased with the result and not regret one bit. In addition, mid range power was felt right away. It just kept on pulling till redline. Wow, what a rush.... IF anyone ever needs their 350Z or Z's tuned, go to Exact Motorsport in Milpitas, Ca. and ask for John. They do an excellent job. Highly recommended.