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-   -   Exhaust Question: Catalytic Converter is bolted to the turbo?? (https://www.audiforums.com/forum/b5-models-69/exhaust-question-catalytic-converter-bolted-turbo-97051/)

dha514 04-01-2008 02:38 AM

Exhaust Question: Catalytic Converter is bolted to the turbo??
 
"On an A4, the catalytic converter is bolted to the turbocharger and then the exhaust begins with the downpipe."

-source: http://www.ecstuning.com/stage/edpd/...tegory=Exhaust

I learned from my last thread that I should go for chip first, then a turbo back exhaust, then a boost controller. While I was searching for a turbo-back exhaust, I found out that the catalytic converter of A4 is bolted to the turbocharger. So does that mean that "Cat-back exhaust for A4= Turbo-back exhaust for A4?" Or do I have to somehow get rid of the catalytic converter that is bolted to the turbocharger and get a test pipe? Or does it mean something else?

I want to get a turbo-back exhaust. (and by a turbo-back exhaust, i mean an exhaust with a test pipe instead of a catalytic converter. My goal is to get about 20-25 hp on the wheels by adding an aftermarket turbo back exhaust.) Is a "cat-back exhaust" from APR or Neuspeed (or any other company)the same as what I mean by "turbo-back exhaust?" Can somebody clearify how exhaust system works on A4's, specifically B5's?

Thank you.

CampbellsChunkySoupr 04-01-2008 09:27 AM

RE: Exhaust Question: Catalytic Converter is bolted to the turbo??
 
just have the old exhaust removed and have whomevers doign the new one, weld in a bung for the o2 sesor. do 2.5" piping. you'll end up saving money as well. you'll need to source a muffler though.

turbo kraut 04-01-2008 10:39 AM

RE: Exhaust Question: Catalytic Converter is bolted to the turbo??
 

ORIGINAL: dha514

"On an A4, the catalytic converter is bolted to the turbocharger and then the exhaust begins with the downpipe."

-source: http://www.ecstuning.com/stage/edpd/...tegory=Exhaust

I learned from my last thread that I should go for chip first, then a turbo back exhaust, then a boost controller. While I was searching for a turbo-back exhaust, I found out that the catalytic converter of A4 is bolted to the turbocharger. So does that mean that "Cat-back exhaust for A4= Turbo-back exhaust for A4?" Or do I have to somehow get rid of the catalytic converter that is bolted to the turbocharger and get a test pipe? Or does it mean something else?

I want to get a turbo-back exhaust. (and by a turbo-back exhaust, i mean an exhaust with a test pipe instead of a catalytic converter. My goal is to get about 20-25 hp on the wheels by adding an aftermarket turbo back exhaust.) Is a "cat-back exhaust" from APR or Neuspeed (or any other company)the same as what I mean by "turbo-back exhaust?" Can somebody clearify how exhaust system works on A4's, specifically B5's?

Thank you.

cat back = factory cat..... the aftermarket exhaust

turboback = tp/hfc...... then aftermarket exhaust


i am running turbo back..... ebay tp.... plust custom built exhaust piping(2.5) into magnaflow muffler

turbo kraut 04-01-2008 10:47 AM

RE: Exhaust Question: Catalytic Converter is bolted to the turbo??
 
http://s50.photobucket.com/albums/f3...t=ac0c1eb0.pbr

SAudi 04-01-2008 02:50 PM

RE: Exhaust Question: Catalytic Converter is bolted to the turbo??
 
the cat attaches to the turbo and pretty much is the downpipe. it is not a turbo bak because it still has a ristrictive cat, most guys get a test pipe to replace teh cat and then its technically a turbo back exhuast because its free flowing from the turbo out.

dha514 04-01-2008 03:51 PM

RE: Exhaust Question: Catalytic Converter is bolted to the turbo??
 
thanks guys. so a tp is a test pipe i'm guessing.. but whats an hfc?

pimphell 04-01-2008 03:53 PM

RE: Exhaust Question: Catalytic Converter is bolted to the turbo??
 

ORIGINAL: dha514

thanks guys. so a tp is a test pipe i'm guessing.. but whats an hfc?
hfc= high flow cat

SuprA4 04-01-2008 04:36 PM

RE: Exhaust Question: Catalytic Converter is bolted to the turbo??
 
find outhowthe emissionsare done in yourstate or you will not pass emissions with a testpipe..unless its not a sniffer test and you can non fouler it

FASTER 04-01-2008 05:30 PM

RE: Exhaust Question: Catalytic Converter is bolted to the turbo??
 

ORIGINAL: dha514
My goal is to get about 20-25 hp on the wheels by adding an aftermarket turbo back exhaust.)
not going to happen...

DaGGer 04-02-2008 01:11 PM

RE: Exhaust Question: Catalytic Converter is bolted to the turbo??
 

ORIGINAL: FasterA4ThanUrs


ORIGINAL: dha514
My goal is to get about 20-25 hp on the wheels by adding an aftermarket turbo back exhaust.)
not going to happen...

From what I saw in the "newbie guide 2" post is that at about 2,000rpms there is a huge increase in power almost 20HP.

http://www.ecodetuning.com/gallery/i...s/b7a4testpipe

Also these non-foulers how do they work? Do they just tell the computer that the cat is working fine?


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