GTI stock downpipe have 2 cats?

[Z27]

I always thought that after the flex pipe is a resonator but after a close inspection of my friend's downpipe, it looks like a second cat. Can anyone confirm?

 

[gn4rwhals]

I know the top one is a cat, I'd have to look at mine later to see if the second actually is.

 

[Serzyfritz]

Both are cats

 

[Stage2Sasquatch]

Both are cats

x2, both look like cats to me

 

[Dave10781]

x2, both look like cats to me

Yusssssssssssssssss

And this one too.

 

[Z27]

Follow up question, do cats help reduce noise like a resonator? Is that the reason why the stock downpipe is quieter than most aftermarket downpipes?

 

[Ricked_Em]

Follow up question, do cats help reduce noise like a resonator? Is that the reason why the stock downpipe is quieter than most aftermarket downpipes?

Correct

 

[SHCKR]

And while we are at it, if I get an aftermarket DP, will I have to always replace it with factory to get inspected, in order to pass state inspection in NC?

 

[Z27]

And while we are at it, if I get an aftermarket DP, will I have to always replace it with factory to get inspected, in order to pass state inspection in NC?

Unless you get one that uses a cat that guarantees no CEL (Neuspeed or AWE).

 

[WolfgangMK7]

Is the downpipe on the performance pack GTI different then regular GTI?

 

[Matt15GTI]

I wonder if you removed the second catalyst if it would add any hp? Poor mans down pipe...

 

[toledospeed]

I wonder if you removed the second catalyst if it would add any hp? Poor mans down pipe...

Did this on my Mazdaspeed3 back years ago...you will gain very little, probably even less on the MK7. Just a slightly deeper exhaust note and maybe a CEL thrown for your troubles LOL. On the MS3, it didn't cause a CEL.

 

[JakeFromStateFarm]

Unless you get one that uses a cat that guarantees no CEL (Neuspeed or AWE).

What if you have a tune that eliminates CEL?

Is all they check just that you don't have a fault?

 

[Dave10781]

What if you have a tune that eliminates CEL?

Is all they check just that you don't have a fault?

That and if your ECU is in a ready state.

 

[Z27]

^ correct. That's why I haven't pulled the trigger yet because Unitronic doesn't have a stage 2 file that is non-testpipe or has readiness available.