Exhaust query

[killarag]

Hello,

Just purchased a 3” Miltek Sportcat & DownPipe

I currently have a FSW (Remus) Non-res Catback Exhaust System on the car but it says it measures a 65mm tube diameter.

Is this likely to couple with the Downpipe or is anyone able link me to something that will allow it to couple with the downpipe?

Cheers!!


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[jason_rmh]

The milltek's are 2.75" diameter which is just under 70mm. It might be ok depending on the outer diameter of the Remus pipe.

I think the cat pipe slide over the centre section pipe, so you might get away with a clamp and some exhaust paste?

[killarag]

Is this likely to have a massive effect on performance compared to a 70mm miltek exhaust?


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[willni]

Is this likely to have a massive effect on performance compared to a 70mm miltek exhaust?


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It would have more effect on a remapped car, but essentially yes as it lets the gases from the engine escape quicker. Don't think you'd feel it a power gain unless it was mapped into the ecu though, might have a placebo effect though like go faster stripes 

[pudding]

Catbacks aren't big players for power unless you're running a massive turbo which needs a drainpipe front to back.

Stock GTI catback with a 3" downpipe and stock intake makes around 320hp on an Ed30.  From there an intake will take it to 330-340.  After that a 2.75 or 3" exhaust isn't going to give a lot more.....maybe 5-10 at the top end.   Not sure what the yields are with the K03....but since the ED30 shares it's exhaust and intake, it's been shown they're not that restrictive.