Will RS2 oem exhaust be OK for 450 bhp ?

[prj]

We have a car here making over 800 hp on the stock s6 back box...

[Rusty]

Changing the diameter of the exhaust towards the rear seems to stop them droning as much. Inside the car, mine's near stock with just 1 box and a cat, as it drops in diameter just under the rear seats, after the exhaust cutout.

[adam g]

Okay so Ive heard going from a 2.75" to 3" may not give much benefit on a number 6 hotside but any thoughts or experience going from a 2.5 to 2.75 assuming a 400bhp target. Basically Im thinking of upgrading to an RS2 DP and now wondering if its worth the extra for a 3 inch instead.

[Rusty]

It's worth going for a custom 3" to ditch the Y pipe and twin cats Better than paying lots for an RS2 pipe and then having to cut and shut it. You could also get a stock 2.5" DP sleeved to 3" after the first bend, as long as the turbine outlet is the same or smaller diameter than the OE DP flange.