Haven't heard it in person but from the vids... I like the hiss. sounds crazy!

Patiently waiting trying to hold back my excitement! Btw, Tony, I want the loudest CBE out there, not a fan of resonators I can put up with the rasp do you have something along those lines?

I think you will get plenty of rasp with no resonators and the headers. It will sound very exotic. I personally am not a fan of that sound but I am a V8 guy, I like things deeper and smoother.

So I called HNGonzalez. We spoke for about 10 minutes. He feels that he may have an exhaust leak. He is going to double check the install and make sure everything is tight. He told me there were no install issues and everything went smooth. We also spoke about the dyno runs. The car was run in 4th gear which is the wrong gear for the 6MT it needs to be 5th which is 1:1 gear ratio. He will be going back soon to get it squared away...

Thanks, Tony

Tony it looks like you have my car on your lift! And you already gave me my free CBE too! Thanks gai! :tup:

I was actually missing 2 bolts and 2 nuts too, I was later mailed the little black heat shrink tubing too. Tony was on it, I didn't even know I shoulda got those :p. Everything else was solid, my shop had spare bolts. As for the install, yeah, it was fast, but he also may have torqued some bolts wrong as there seems to be a leak. I think having an aftermarket intake cut on install time too cause he litteraly took out my injens in ~10 mins. I'll look more into it later, I'm having too much fun now :)

ID like to mention that with my 12" res there is absolutely no rasp. The sound is amazing and the shop as well as bystanders had to pick there jaws off the floor. Myself, I couldn't stop grinning :tup:

Headers on a 370Z/350ZHR are sooo much easier to install than the old DE's :)

You probably dont have an exhaust leak. I didnt install my LTH's yet i got them in the mail yesterday btw. I currently have non resonated test pipes and you hear a small hiss durring heavy acceleration im 99% sure its the air traveling through the x pipe at such high speeds.

I have always had a feeling that these headers would turn out this way.. im pretty sure they are great thru the mid-range. The hiss should be the same as mine gives on resonated test pipes. It is pretty loud when decelerating at about 1k -2.5k RPM's with the windows down and the radio turned low. Many people think something is wrong with it or say my car is cheap for making noises and being new. But most of these people making these comments are car dummies.

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.

I absolutely agree with you

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.

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