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Changed the spark plugs on my c6 rs6 today and now I think I have a boost leak. I can hear a fairly obvious hissing noise on acceleration which I don't think was there before. I did clean the serviceable air filters while I had it apart but I'm certain I reconnected al the lines. Car runs fine and gauge seems to show decent boost however I am now thinking its down on power but may be in my head. Any advice guys?

Sounds like loose connections to the charge air pipes that sit on the air filters. Are the pipe clips tight? Worn out?

Is your engine stock or tuned?

Nick

Tuned, have never noticed the noise before yesterday when I had everything disconnected to change the spark plugs.

Does it hiss all the time under acceleration, even with part throttle, or is only when you really lean on it? Do you get a bit of a lurch when it starts to hiss? Are there any warning lights?

Nick

This maybe "sucking eggs" time, but have you rechecked all the bits you took off when doing the spark plugs (airboxes etc), especially the pipe work to the integrated dump valves built into the bottom of the airboxes?

Have you got VCDS? log requested and actual boost as the car will compensate if it's leaking boost so you may not even realise you have an issue.

Loose hose clamp. What a moron I am! Was in a rush at the end and had to whip an air box back off to check something ad forgot one of the intercooler hoses was loose!