'Hissing" from header.

TSX_WS · 05-01-2009, 08:25 PM

So, like many others I am an owner of a Topspeed header. We all know that flex pipe causes these headers to hiss, and I had mine replaced by a local exhaust shop. 80% of the hiss seemed to disappear but some quiet, deep, whistling hiss was left. So I went to that shop to have my old heatshield welded to RT cat and asked the guy to check if there are any leaks. He observed the system and listened to it and says that there are no leaks and and the sound is generated by the flow of the exhaust gas inside. After he welded the heatshield, he told me that the sound became quieter. I know that a few others had this issue, so what do u all think? Opinions are appreciated.

msm_ching · 05-01-2009, 09:13 PM

welded the cat on the cat? hmm..

I did fix the flex pipe too. It's 100% hiss'less.

and as for the heat shield. i left it out of my car.

HoRRo · 05-01-2009, 10:30 PM

The hiss decreases (and may even disappear) after some carbon builds up in the flex pipe. I have the Topspeed and initially I had a 'hiss'. Was like the sound you make when saying "effffff', the f's at the end. Either way, after a couple weeks, it got more quiet, and it's either I don't hear it anymore, or it's really gone.

Also, I'm running on the original Topspeed flex pipe.

TSX_WS · 05-01-2009, 10:40 PM

Well.... the fuel that I give to my car doesn't seem to give it much carbon. Should I try cheaper octane 87 fuel?

Oh and ur sig says that ur car is stock, but u just said that u have a header.... busted!!!

HoRRo · 05-01-2009, 11:47 PM

Quote:

Originally Posted by TSX_WS

Well.... the fuel that I give to my car doesn't seem to give it much carbon. Should I try cheaper octane 87 fuel?

Oh and ur sig says that ur car is stock, but u just said that u have a header.... busted!!!

Regardless of what fuel you give your car, you will have carbon, just that most of it is in the cat, so you don't see it on your exhaust tips. Since the header is before your cat, there will be carbon on the inside of the header for sure. Just look at your stock exhaust manifold.

TSX_WS · 05-02-2009, 12:41 AM

hmmmm its been about 3 months since I replaced the flex pipe, but the sound hasnt changed. Maybe the guy was right and the sound comes from the inside or something?