My mechanic's thoughts on the Berk CBE & HFC

Shadax

Yeah I'm not sure on his confusion about 4 cats. He pointed to the piping in front of the cats (not the exhaust direction, the other side. Between the cat and the headers I guess?). So, almost as if he made it seem as if there was an additional cat in front of each one. If that makes sense.

Not sure what would compel him to think that.

Not gonna lie, i lol'd haha

SS_Firehawk

Everything between the headers and midpipe on these cars is a huge restriction on your exhaust. So anything that opens that up (HFC, LTH, or Y pipe) will see a large increase. The rest of the exhaust, get what you like

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m4a1mustang

Maybe there were two actual cats living just south of the manifolds. Ya never know.

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GaleForce

Come on meow, that's a little far fetched...

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MaDMaXX

In for the lols


A lot of mechanics identify cats by looking for the heat shielding, if a factory exhaust has bracing or just heat shielding for the heck of it, they usually yell cat!!

Red__Zed

Which helps us all out when it is time for an inspection

Shadax

Just picked up the car. He said everything went smooth, and it does sound really good.

Only thing is I can *definitely* hear air coming from where the cats are. At high RPMs on the road it's noticeable, and when I have the car stationary with the door open during revs. Should I be able to?

For example if I give it a nice rev up to 4k while in neutral, on the release I'll hear air from the front-middle of the under carriage.

I was a bit concerned at first, but I wasn't sure if it was because I'm not used to it, or something isn't right.

kielbasa16

If its a hiss on deceleration, when you let go of the gas, then this is perfectly normal. Modifying any component of the 370Z exhaust has this effect, particularly the cats. If you hear it when revving up, when accelerating then you could have a leak.

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Mag Black Kielbasa

Shadax

Huh. I think I actually do hear it when accelerating.

How can I absolutely determine if there's a leak and how is it typically rectified?

Thanks for this info!

Do you hear the hiss when accelerating too?

Alchemy

You will hear a hissing sound at low RPM. TOTALLY NORMAL. My test pipes hiss like a mo-fo! Esp around 2k

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Ryan
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MaDMaXX

Vid of the sound or it doesn't sound cool

Also, it might help to hear the sound if possible.

Staples

What he said ^

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Shadax

One more thing. And I'm on mobile at the moment. But I revved the car just now and I can actually smell exhaust. Just throwing that out there ... Shouldn't be normal right...?


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Ages

It's a new exhaust so it's gonna smell a bit. The hiss is also normal when you put a set of HFCs on the vq37 vhr.

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