so ive noticed recently with having my z1 hfc installed, that it almost sounds like air is forcefully escaping when accelerating at the lower speed range. it sounds almost like a deep hissing noise. the gaskets were replaced with z1 metal gaskets where the cbe was installed, but not towards the headers since the replacement (i had the hfc installed at a shop). Is this normal? Is it just because theres alot of air?

I dont get codes, problems, or whatever, but it is kinda interesting, and my friend made a comment on it before, because it is unusual. When I get headers installed, ill probably be replacing those gaskets with metal higher quality ones.

Thanks

 

Supposedly that is normal for hfc and test pipes

 

i wonder if upgrading the headers would stop it, maybe its all the air or something. idk im not crazy savvy on it, but it is a concerning sound at first is all

 

I have test pipes and am thinking about long tube headers. From what I have read, that should take care of it

 

did you install extenders on the o2 sensors? Only asking because I also have z1 hfc and I believe it's throwing a lean code

 

no, and i dont throw codes