installed test pipes the other day on my 2008 g35 sedan and ever since it’s been making this loud high pitched noise. anyone know what it is? i’ll add a link to what it sounds like

https://youtube.com/shorts/lQftYWpQIYA?si=LDRAvhg84BXUnf79

 

The Lovely V6 test pipe hiss. Highly recommend test pipes with good resonators like Motordyne’s ART pipes.

 

i’ve heard people run test pipes on the vq35hr v6 and i’ve never heard this noise before.