Hello everyone. I am new to the site and fairly new to Infiniti. So about a week ago I had just installed my exhaust system which includes Invidia test pipes and their Gemini exhaust system. My question is that is that when I rev my car, at the end of the rev a little hiss noise happens as if air is escaping. Also, when I get on the gas when driving, I can hear rattling as well. I've brought it to a local muffler shop and they told me that there are no leaks. That since I have the test pipes on there is too much air flow. Just wondering if this is normal or not.

 

Normal and welcome to the hiss club.

 

Around is correct, Normal VQ noise and bet it louder when you first drive the car till the TP's heat up. We all experience this

 

Thanks Around and ANMVQ. Thought it was a leak or something.