Hmm, I'm not sure the outlets are the same, since volumetrically, they're pumping more air
 

so I would assume they would need to have slightly larger outlet, no? I know our K03s dont have a K04 exhaust side... so there has to be a size difference...

You have mail.

yeah...
 

I think you're right, I was thinking about the flange size and the overall housing size which I believe are the same. I'm certainly no expert, but I've bought into "bigger is better" regarding turbo exhausts... to a point.

APR's

The only problem I see with something that may be too large
 

which I am not sure any aftermarket ones are 'too' large, is that your exhaust gases will cool pretty early on in the system, thus slowing exhaust flow down...

I look at it this way - hooking up a firehose to your houses spicket (I know it wont fit, but lets pretend for analogy purposes ;-) won't allow the water to flow out any faster, infact it may actually slow down. Now if you use the one that fits properly, you get a higher pressure, meaning it will come out faster... I see this as similarly to exhaust systems... People will tell me its not a good analogy, to compare water + hose = but I think it's conveys the idea...

Right back at 'cha - thanks.

Nice pics, but what's the difference in terms of hp/tq between the two?
 

Will you lose some bottom end tq with bigger dp's in general (with K03's)??

I would love to see a comparison on stock, stock with gutted precats and Awe, Apr, Milltek, RS4 dp's.

So what it comes down to is if you purchase from "A" ya never never
 

never know what you are going to get.

How do you gut dp's?? Does this entail getting rid of any of the cats?? TIA.