Which downpipe?

[donovan2123]

Sorry to bring the thread from the dead but i am serously considering a 3" downpipe decat i have seen on ebay. It is how ever listed for a mk5 GTI but i own a skoda octacvia vrs. So does anyone know if the golf mk5 gti downpipe decat will fit my VRS?

[donovan2123]

Bump

[56OctyVRS]

Looking at the two I would say yes as they both use the same standard downpipe. Personally I would get one custom made to same diameter as the milltek. 3inch DP are good at flowing high end but they can lose low end torque on the K03.  AWE use 2.5inch pipe as it retains the same low end torque as the OE DP without losing too much top end power.  The general consensus is that a 2.5inch exhaust is good up to about 350bhp, dependant on application and turbo size.  Over that and you do need a 2.75 to 3inch exhaust but bare in mind that the K03 is not a large turbo by any means.  Id stay with a 2.5 to 2.75 inch DP.  I would only go 3 inch if I was going to a K04, which for me is on the cards

[kiddfrost]

I agree with 56OctyVRS. A couple of years ago I actually installed a 3 inch Milltek DP on my k03 gti mating to the oem catback.
The theory was get more top end knowing I could afford to lose a little bottom end. I was stage 2 at the time. I did get a bit more top end but lost a lot of low to mid so I totally believe the 3 inch is to big for the k03. Needless to say it came straight off.

[donovan2123]

Kool so do you guys think i should just get 3" dp into a 2.75" pipe and sports cat?

[56OctyVRS]

You should a get a 2.5 or 2.75inch DP into a sport cat.  You will get good peak gains but also retain the low end torque.