question, if you had test pipes and exhaust done
 

Please let me know if you have had this issue and if it's normal. :ugh2:

I have a 2013 Nismo and I had Stillen Generation 3 Long Tube CAI, FI Non-Resonated Test Pipes and FI exhaust installed. They also tuned the car for me. The car runs GREAT, but is making a horrible noise.

I have a noise coming from the car every time I let off the accelerator. It is loud and doesn't sound good.I took it back to the shop and they said it's just backflow from the test pipes and exhaust.

Have you experienced this? if so what can I do?:confused:

Sounds like a hiss when you slow down?
Yes that is normal.

:iagree:

If you want to get rid of it then put the stock cats back on.

Agreed but ITS THE BEST SOUND EVER! Makes it seem like your Turboe'd!! Hope ya keep your setup on them test pipes sure let our Z's Scream :tup:

its normal, nothing you can do about it. learn to live with it.
Some have said the motordyne testpies and exhaust combo does not have this hiss, I do not know so better check with them

I really don't like the hiss, but I LOVE the exhaust sound and power.

It has so much more power and torque, there's no way I could get rid of it. Can't believe the difference it has made.