remedy for hissing sound?

TPrelude-370z

Thanks for replying. Did you have an aftermarket y pipe also? I had no hiss with the test pipes and stock exhaust. There is no way I am taking off those test pipes just out of principal.

It took a shop 8 hours while I sat there, and then an 02 sensor went bad (they replaced it, great guys). The power I get from the test pipes is more substantial than the y pipe.

I know there is some way to fix this. I am going to try some different options and see what I can come up with. I have faith in my exhaust place that they will figure something out. I still plan on installing my own muffler/resonator and tip combination as an axle back exhaust (already have the parts).

I planned on doing one thing at a time to feel the power increase and hear the sound improvement. Hindsight I would have been better off with HFC and exhaust. But hey, what would be the fun in that.

Cell

You should of went to project X to get your test pipes put in. Don't have some random shop do it. project X has tons of experience with the vq motor. The reason that shop took 8 hours was because of the demon bolt.

All the time and money that you will put into this will cost a pretty penny if you decide to go that route of piecing it together one by one.

TPrelude-370z

I agree to stick with knowledgeable shops. I took it to Genesis racing development whom is well known and respected in the z and wrx community. I just moved here and was referred by ams I believe whom work on gtr and other higher end cars (they wouldn't even do it for me).

they had done the job on a z many times without issue. I knew the bolt would be a problem that is why I took it to them. Regardless they never quit until is was done, charged me 140$ for 8hrs worth of work, paid for and installed at 180$ o2 sensor. How many shops would do that?

I may have found a solution to the hiss, I will post a more detailed thread about options I have found and custom exhaust work. In hind sight I would have just ordered a name brand one, but this is going to be a fun journey. I have multiple options to try and fix the hiss and make the exhaust sound good. It will be a trial and error type thing but it will eventually end up great.