A6 2.7 Bi Turbo 1999

Hi Chris,

don't take this the wrong way, but being as it's a nearly ten year old car my advise would be to make sure everything is 100%. The 2.7T engine is great when working well, but there are a few typical problems that they suffer from. I'm sure a search will tell you, but double check the following: vacuum hoses, divertor valves, boost pipes, MAF sensor, lambda probes, coolant temp sensor. A full service/check might just give you more than an airfilter. To be honest I wouldn't bother with an aftermarket one. A remap is the best point of call for increased performance on the 2.7T! I hope this helps.

No problem Chris,

I'd take a guess that you'll need to have the throttle body boot replacing. This is located at the front of the engine bay underneath the divertor valves, they have a tendancy to split on the underside (out of sight!)... it's highly likely this is where the leak is!

Audi's replacement part is actually revised as it was a comman problem, but the likes of Forge, SFS and Samco probably do replacments as well.

Could be worth them checking this first!