GTRS Test pipe advice?

[slopoke]

I know the 2.5" ID VMR and also the 3" ID Eurocode will fit my k03 and GTRS but will the 2.5" size be sufficent for the gtrs or would 3" be more beneficial? I know the 3" is overkill on the k03 but not sure about the GTRS.... THANKS!

[JumboBlack1.8]

3" would be perfect for the gtrs, since you want that turbo to flow as best as possible. But, from what i've read, if you have a 2.5" downpipe, then the 3" TP is essentially negated. The exhaust will only flow as well as its largest restriction (i.e. 2.5").

[slopoke]

I have a neuspeed and itsrated mm i have no idea how many inches it is lol.. guess 2.25-2.5

Neuspeed Stainless Catback Exhaust System
Other products by Neuspeed
Item#: 30.02.25
Vehicle: Audi A4 B5.5 (00-01)
Only Fits: Quattro 1.8t 5 Speed ONLY
Note: Dual Straight Polished Tips; Piping Diameter - 60-70mm

[slopoke]

eh which i guess equals 2.3622 inches - 2.7559 ROFL

[GetBoosted84]

I have a neuspeed and itsrated mm i have no idea how many inches it is lol.. guess 2.25-2.5

Neuspeed Stainless Catback Exhaust System
Other products by Neuspeed
Item#: 30.02.25
Vehicle: Audi A4 B5.5 (00-01)
Only Fits: Quattro 1.8t 5 Speed ONLY
Note: Dual Straight Polished Tips; Piping Diameter - 60-70mm

Thats the same setup I'm running right now. I have a ATP downpipe running right into my neuspeed exhaust. Although only the first part of the exhaust is at 60mm so JM Fab hacked that off and re-did it with a 3" to 2.75" adapter.

Only complaint is that it's much louder then when I ran with a labree HFC coupled to a k04. Definitely not unbearable by any means... just sounds much more angry.