External wastegate questions...

**Jet Jockey** · 10-02-2008 09:35 PM

For those running with an external wastegate, what is better?

Exhaust externally to atmosphere?
Exhaust the flow somewhere down the line in the downpipe?
What's the theory behind either option?
What are the pros and cons to either way?
Which if any gives you better performance?

TIA

**audikid66** · 10-02-2008 09:40 PM

i suppose it all comeas down to how loud you want it to be..i can't see there being a performance difference..but i could be wrong

**sean1.8t** · 10-02-2008 09:41 PM

vent to atmosphere. do it!

before i list off some pro's. it is said that the external WG pipe to the downpipe will crack in no time anyways. even with a flex pipe between them

pro's:
more flow-in both turbo outlet and overall exhaust gas flow
easier to maintain
much more options in sizing

Con's:
it's loud/annoying for a daily driver.. but look who im talking too

**akaEsCo01** · 10-02-2008 09:53 PM

Can't you make it quieter depending on where you route your piping to. I have also seen setups with muffled (motorcycle mufflers or somtheing just as small) wastegate dumps that made virtually no noise

**AudiA4_20T** · 10-02-2008 10:23 PM

I want my shit to scare the hell out of people

**actlsub9** · 10-02-2008 10:31 PM

Given what your car is, I can't see any pros that outweigh cons to have it routed back in (noise, etc...)

**Killerteve** · 10-02-2008 10:49 PM

I agree with Greg. On a track car I would never consider routing it back in. Of course if you did I doubt that the increased exhaust flow would matter since you won't be maxing the flow of your piping and technically that same volume of exhaust would be flowing through the pipes if you wg wasn't open anyway.

**B6Lovin** · 10-02-2008 11:00 PM

but if the wg isn't open it's more volume to occupy for the gases which will theoretically decrease performance by decreasing velocity and adding a new, non-direct, path for them to follow.

on that note -- open dump is fun as hell. DO IT