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View Full Version : 2.5 or 3" testpipe for full supp. mods K04



a4fann
06-26-2007, 10:06 PM
I cant decide if I want to go 2.5" or 3" I have noticed that the 3" can be hard to install, but I do have a lift so it should not be that hard. Also is the 3" testpipe for sale on 034's website an atp pipe or a custom one made by them? (Mike)
Thanks guys.

Devious27t
06-26-2007, 10:29 PM
2.5" is plenty fine for what you have and probably what you will put on

bOOOOstedAudi
06-26-2007, 10:32 PM
yeah k04 is still tiny

a4fann
06-26-2007, 10:33 PM
yeah k04 is still tiny

Thanks for rubbing it in[:(] BTW will there be any difference in power between the 2, with a k04 I couldn't see there being much.

a4fann
06-26-2007, 11:08 PM
Mike, 034 info?

er1c
06-26-2007, 11:34 PM
I just ordered the 3" testpipe from atpturbo.com -- it came out to $180.56 w/ shipping. I also ordered the 3"x6" flexpipe from ECS Tuning. Is there anything else I need to buy--- or can I go straight to a muffler place and have them connect a 3" downpipe to these parts?

T28_A4
06-27-2007, 01:50 AM
the atp tp goes for 145 on ecodetuning.com ...

Peter@VMRWheels
06-27-2007, 02:02 AM
Not sure if it matters much, but it does depends on what diameter the exhaust system is. If you have a 3" TP with 2.5" exhaust pipe after the TP, it defeats the purpose of going to 3".

er1c
06-27-2007, 02:48 AM
Great! I just overpaid for it then.

Euro-Tuner
06-27-2007, 04:01 AM
what software are you running? if its GIAC, chances are it is, it calls for a HFC, it will not run as good w/ a test pipe

UN-PIMP-Z-A4
06-27-2007, 05:20 AM
I just ordered the 3" testpipe from atpturbo.com -- it came out to $180.56 w/ shipping. I also ordered the 3"x6" flexpipe from ECS Tuning. Is there anything else I need to buy--- or can I go straight to a muffler place and have them connect a 3" downpipe to these parts?

What are you using the flex pipe for?

98a4
06-27-2007, 05:27 AM
Not sure if it matters much, but it does depends on what diameter the exhaust system is. If you have a 3" TP with 2.5" exhaust pipe after the TP, it defeats the purpose of going to 3".

No it doesnt. Relaving back pressure directly behind the turbo is most important. It has time to travel down the exhaust and increase velocity and not create much of a bottle neck.

a4fann
06-27-2007, 09:40 AM
I have an evoms HFC on it know and I just wanted to change things up a bit. I gonna keep the cat though.

a4fann
06-27-2007, 09:41 AM
Im still wondering if that 034 one is an atp pipe or one that they make.

er1c
07-03-2007, 01:20 AM
What are you using the flex pipe for?

I was told I need the flex pipe to reduce vibrations.

a4fann
07-03-2007, 01:38 AM
what software are you running? if its GIAC, chances are it is, it calls for a HFC, it will not run as good w/ a test pipe
nope...

94jedi
07-03-2007, 06:34 AM
Not sure if it matters much, but it does depends on what diameter the exhaust system is. If you have a 3" TP with 2.5" exhaust pipe after the TP, it defeats the purpose of going to 3".


maybe on a k04 but on a t28 or larger it will be very beneficial. everything I've read suggests that removing any restriction directly behind the turbine or somehow adding volume to that area (larger diameter piping) will be very beneficial.

I had a 3" TP on a k03 w/ stock exhaust and I felt a butt-dyno difference for sure. I wish I would've dyno'd or tracked it. Spool up was faster, I felt more tq. it's a definite improvement.

for a full supporting mod k04, I would go w/ a 3" tp. it won't make a huge difference but it will help. besides, why not go w/ a 3" TP? unless you want to run a cat.

94jedi
07-03-2007, 06:37 AM
Im still wondering if that 034 one is an atp pipe or one that they make.

I had the ATP pipe and it didn't exactly fit well. the threads on the flange had to be re-tapped because the studs wouldn't screw in all the way, thus causing an exhaust leak.

pm bitterchild and get an ER TP. much better quality and finish. I have no experience w/ the e-code tp.