MP4.2+6.0

K&N. Best thing ever to come along for Bosch and Hitachi to sell more MAF's. They ought to sponsor K&N! Yep, no surprise K&N tries to dispel the "myth" since it shoots sales right in their back side. Trouble is, I can tell you first person, I saw it and experienced it. 2000 A6 4.2. Took out my MAF, with documented pre and post metered readings. And "I know how to oil em" from 20+ years of experience on pre-MAF vehicles--the usual retort from some kid thinking "hot stuff" gotta have it, I read it on the internet or saw a You Tube video.

The nail K&N to the wall was when I found their tell tale red oil spread along my 4.2 intake tract in a super fine mist from the filter by almost two feet. All the way to the throttle plate that is about 2 feet from the air box on a C5 4.2. MAF on that one is about half way in between and inline flow wise. It is "uphill" from the filter so no gravity baloney involved either. Even better (worse), it was following the year or two earlier and 20K miles install of a NEW one with their factory oil, not any [know how to do it] later maintenance. Flat out, I believe that web site stuff from K&N is a lie, from my direct, with my own eyes experience and with the VCDS MAF test runs to back it up. Specifically, the post K&N screwed up MAF ran with VCDS measurement block air readings about 20% below the replacement OE I put in. While the O2 can correct for that (up to 25% IIRC), it probably introduces a lag to the mixture control of the length of the air flow from the MAF metering point through the motor and combustion cycle to the O2 front sensors, which is probably 5 feet or so.

Net, K&N = performance subtract.

Better, put their stickers on the C pillar side window so I know the car has been quietly crippled over a few years, and I can now laugh with the personal experience to back it up!

Doc Norton

Sorry, misspelt - Terra Clean - cost me an intake manifold (a.k.a. a small fortune). Assuming the pressure used in cleaning process broke somehow one/two intake 'flaps' => some pieces ended up stuck in the valves. Luckily not did not find their way in the engine as that would have been a real disaster. I'm certainly not engine specialist or anything like and I understand people may have different views of reasons. I very much doubt that there were anything 'existing failure in the background', no, I don't think so,.This breakdown was so obviously i.e. instant flagging out the engine warning light in the dashboard on spot, confirmed by checking VCDS error codes => taking off the manifold pretty much straight after the incident...…. and then a hell of lot loud swearing followed . Anyway, based on my personal experience I can assure I'll not do the same stupid terra clean mistake ever again.

Samo7

i also have staggered wheels and I love the look. I do it because I can. I have also have an 2017 A4 technik/S Line fully loaded. Heads up display, etc.

Jack88

Since Misha can't respond, I will. You can technically fit staggered wheels, but it's hard on the center differential since your front and rear wheels will have a different RPM constantly unless you got the sizing right on the money so that the overall diameter of the front and rear are the same, but that is hard to do for any wheel with a visually appreciable difference.

Doc Norton

Somehow my earlier response did not appear here, so I try again.

Terrafirm – apologizes, my misspelling – I meant Terra Clean. The result of this carbon cleaning was to break one/two intake flaps. Some pieces of these flaps found their way to be stuck on valves. Luckily nothing ended up in the engine itself as that would have been disaster, I’d assume. There may be different views whether it was carbon cleaning that initiated the flaps to disintegrate but it was an immediate result of the cleaning. My understanding it must have been related to ‘high pressure’ cleaning method. As a result, I had to buy a new intake manifold, which is not a particularly cheap piece of metal. Audi’s part delivery service was not admirable either – it took a bit over two months to receive the part (instead of 5 days I was told initially). Neither you can find them (second hand) easily from Ebay…. Unless you are prepared to take a risk buying something already suffering the similar kind of problem…Anyway, that’s history now but I can assure that there will be no Terra Clean ‘service’ for me under any circumstances as my previous experience was nothing more than just a very expensive headache.

EHLO

Thanks, the high pressure appears to just be in the container the solution is put in, and that it doesn't actually pressurize the intake manifold itself;
https://www.terraclean.co.uk/how-terraclean-works/
If they ran a line into the intake manifold, that may have made physical contact with the intake flaps.
I dripped Redline SI-1 into the vacuum line, turning into mist and landing on the intake valves.

Tublant57

​​​​​Wheels.
Hey what kind of wheels are those and where could i buy these for my S8?