OriginalSterm

I've seen exhaust systems both with and without a wastegate tie-in. What is the advantage/disadvantage of either?

streckfu's

If you don't have a wastegate tie-in to your exhaust, your wastegate will dump to the atmosphere which is a big no-no for emissions. It's for track only applications. Unless you're in a state without testing.

Tom M'Guinn

Not to mention the noise!

OriginalSterm

Is it annoyingly louder? Any effect on boost? No emissions as of now in NYS, but the car is also destined to be a track rat.

Tom M'Guinn

I've heard other turbo cars without a tie-in, but never a 951. The other cars were too loud for the street in my opinion. I'm sure someone else on here can give you a first hand 951 impression.

NZ951

I think they call it a screamer pipe with the WG goes to atm. I have been in an EVO with one, not that much louder. Makes a different kind of noise though... hard to explain.

Sam Lin

As mentioned, emissions is the only reason not to - the noise isn't much louder in my experiences. Exhaust flow is a little better without the tie-in's added turbulence, though how much is hard to say, and the same goes for boost, with lower exhaust backpressure on the turbo.

Sam

Pa_951

ive been in a turbocharged integra LS without a tie in...from what i remember it wasnt that loud, but it was prolonged.

Edman951

On some car its not as load because of the wastegate location.
But on our car its load.
See my 2 video
http://www.geocities.com/edman951/video.html

I plan on installing a resonator, or rerouting it back to the muffler.

BoostGuy951

I have my WG dumped to the Atmosphere. It is wicked loud.

Its all personal preference though. I dont usually get on boost driving around town so I never hear it. I do love the sound though.

bronco951

ive seena few cars around ehre that have them release to teh atmosphere and they do emissions testing ehre. will it actuly make the emissions test worse, or is it jsut illegal to have done?

Jeremy Himsel

Guys, correct me if I'm wrong but I believe the wastegate dump pipe feeds into the exhaust after the catalytic converter on the 951 stock converter pipe, so I don't think emissions is a concern or affected. Anyone have a picture of a stock cat?

We (a friend and I) recently picked up a 951 that had the WG venting to atmosphere. The only problem was that he didn't cap off the tube on the cat pipe so most of his exhaust exited under the car instead of through the muffler. It sounded like a 327 with a blown header gasket.

Jeremy Himsel

Here's a picture of a factory pipe. As you can see the WG dumps well after the CC and therefore will not impact emissions if you remove the dump pipe. On the rolling dyno emissions tests the WG does not open, but I'm not sure how Porsche slid this by the EPA certification?

fortysixandtwo

On the WG dump tube, the section with the larger diameter is a CC. You can see CC material if you take a look.

streckfu's

The wide part near the end of the wastegate tube is a small cat.