LTH = Installed, Review

F.I. Inc. · 04-20-2010, 02:34 PM

Quote:

Originally Posted by jmlenz

I have asked this question and never got a straight answer...does anyone know what is the actual cause of this hiss noise? I have the FI CBE + FI test pipes and the hiss is pretty loud already, I imagine with the LTH its even louder. Its a tradeoff for the killer exhaust note but if I had a choice I would eliminate the hiss.

The hiss is almost the same with the headers as the test pipes. The one trade off is the headers promote less drone inside the cabin because they promote a higher exhaust note. The exhaust will not be as deep and bassy. Some may like it and some may not!

As far as what causes the hiss, I do not have a definitive answer so i do not want to speculate. Obviously the sound is promoted by aftermarket exhaust components because the tubing wall is thinner and the sound escapes easier.

Tony

Daishi · 04-20-2010, 03:19 PM

Quote:

Originally Posted by F.I. Inc.

The hiss is almost the same with the headers as the test pipes. The one trade off is the headers promote less drone inside the cabin because they promote a higher exhaust note. The exhaust will not be as deep and bassy. Some may like it and some may not!

As far as what causes the hiss, I do not have a definitive answer so i do not want to speculate. Obviously the sound is promoted by aftermarket exhaust components because the tubing wall is thinner and the sound escapes easier.

Tony

Tony I was doing some reading up on the hissing noise. some of the guys on my350z.com used the magnaflow resonated x pipe the same one you use on your 350z catback exhaust and the hissing went away. And with some further searching on google other people that have x pipes and no cats on there cars for example mustangs they were getting hissing too when x pipes were used.. Im pretty sure thats what it is.

F.I. Inc. · 04-20-2010, 03:50 PM

Quote:

Originally Posted by Daishi

Tony I was doing some reading up on the hissing noise. some of the guys on my350z.com used the magnaflow resonated x pipe the same one you use on your 350z catback exhaust and the hissing went away. And with some further searching on google other people that have x pipes and no cats on there cars for example mustangs they were getting hissing too when x pipes were used.. Im pretty sure thats what it is.

I have heard other systems on this car that used H Pipes. They had the hissing noise as well. I can even hear it with the stock exhaust, no X pipe there! The X pipe we use on the 350Z will limit your power and that is not we want to do. That is a step in the wrong direction. If the X is the issue which I think it is not, then I myself would live with it for the performance trade off.

BTW, did you get your care package, what do you think?

Thanks, Tony

Daishi · 04-20-2010, 10:00 PM

Quote:

Originally Posted by F.I. Inc.

I have heard other systems on this car that used H Pipes. They had the hissing noise as well. I can even hear it with the stock exhaust, no X pipe there! The X pipe we use on the 350Z will limit your power and that is not we want to do. That is a step in the wrong direction. If the X is the issue which I think it is not, then I myself would live with it for the performance trade off.

BTW, did you get your care package, what do you think?

Thanks, Tony

lol yup got my care package. looks great just have to find some time to install these.. I already did the x pipe myself thats easy.. as far as the headers do you absolutely have to disconnect the steering knuckle.. if i remember correctly your test pipe install said to do the same thing but i got it done without disconnecting it..

F.I. Inc. · 04-21-2010, 09:27 AM

Quote:

Originally Posted by Daishi

lol yup got my care package. looks great just have to find some time to install these.. I already did the x pipe myself thats easy.. as far as the headers do you absolutely have to disconnect the steering knuckle.. if i remember correctly your test pipe install said to do the same thing but i got it done without disconnecting it..

Yes,

You have to dis connect the steering shaft. You will never get the driver side manifold out or the new header in if you don't.

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