Hey Guys<O</O
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I am sure this has been asked a zillion times but I couldn’t find anything on the forum so here goes. Last year I installed a Tubi Street exhaust on my 08 911 Turbo and I love it. The only question/concern I have is when I start the car for the first 2 minutes the exhaust sound awesome deep and throaty and then it quiets down after about 2 mins. Is this normal because the exhaust note on start up is what I am looking for. I don’t want the Race version because I will have problems with inspections. Any help or advice would be appreciated.<O></O>
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Thanks Steven

 

What you are hearing is the result of the cold start function which automatically activates when the engine is cold. It activates a valve in the intake plenum which alters the exhaust note to that "loud and crackly" sound. The idea of the cold start function is to heat the cats up as quickly as possible so they are able to arrest the emissions. Once it kicks off, the note returns to a more subdued tone. Regardless of what exhaust you use, whenever the cold start activates the note will be louder than when it deactivates.

 

There is a lot more going on than what Paul described, but he is correct.

For a little light reading:

 

What you describe sounds pretty normal. I'm afraid if you want that throatier exhaust sound with cats you're going to have to change exhausts to either FVD (which is what I have and love it) or EP (which is what a lot of others have and love that too). Tubi street is definitely more on the mild side.

Interesting read. Thanks for posting.

 

ttdude will the FVD exhaust with cats give me that throaty crackly sound I have now at start up but goes to normal after a minute or 2 for teh whole time or wil it get lower after a minute after start up??

 

PM sent. Cold/Warm start see:

My FVD Sound Version Catless Exhaust

Other FVD sound clips:

http://www.youtube.com/watch?v=aIpY7yWo-Ns

 

Here is a clip of my car


http://youtu.be/N-di6xC04rk

 

Nice demo. I like that runway you got.

 

cheers bro


Yeh the runway is in my back yard


P.S. Your cars sounds nice too. Have you had any CEL issues without the cats?

 

I had FVD catless exhaust system, personally, it's a little too loud for my taste and I can NOT hold a conversation with my wife whenever we go out for a drive. I've had Tubi street and it's too nimble and Im on GMG exhaust now and I love it for now.

 

My flash takes care of the O2 CEL if that's what you mean. No other CEL issues either.

 

installing my FVD exhaust today thanks Dave (ttdude) keep you posted on how I like it stay tuned

 

Are you installing cats or catless? Either way, the sound is superb, no drone. Now you need to get a tune.

 

Fvd is going to sell a boatload of those then !