now i love it...

[SR71]

Its AntoRS4 who has done the work...AndyUK911 merely hosted the pictures in visible form...

There are, as I understand, no pictures of the original manifold. Its just the modified manifold on view with the polished and blended inlet. The close-up indicates the work that has been done polishing.

I imagine, stock from the factory, the appearance of the whole inlet would be similar to the remainder of AntoRS4's inlet which has not been polished...i.e., with the rough cast surface. That said, the exits of the inlets do look like they're "polished"?

I'd not have thought that the work changes the acoustic properties of the manifold much because its length hasn't been modified but what do I know....

[silverRS4]

You're right it was Anto who did the work (sorry Anto!) Although I'm still pretty sure a majority of the ports shown are "before". The one "after" port is not well lighted, so its hard to see. Anto should chime in and clarify. Interesting project, nonetheless.

[Andyuk911]

The bottom line is that if you gas flow the head, you will gain some performance .. but as ever, you have to balance the cost if you can't do it yourself. Agreed interesting post, just need some better pixs .. I am not taking my car apart, just to take pixs.

[AntoRS4]

I don't have pictures "after", you can see the beginning of my job only in the bottom left port as in SilverRS4 post.

[sonny]

wow that’s some seriously bad flash on the edge of that lip...(don’t show the M3 boys this pic), no wonder, if this was the case then a Port and polish/Gas flow should b highly recommended on these cars!

[SR71]

Good spot then SilverRS4!

I just couldn't believe that the stock manifold wouldn't have been totally polished if they bothered to polish the top of the trumpet...but I obviously wasn't looking close enough...

[Andyuk911]

See a bit of a pain to take apart ..

[Dom81]

How clean is that engine!!

[Plodwyn]

What have U used to keep it that clean?

[cit1991]

Now I understand what you did. You just took off the edge where the machining stopped and cast surface remained, but was too high.

That manifold is begging to be extrude-honed.

http://www.gethoned.com/process.html

[Jezzer]

Andy, Can't believe how clean your engine bay is or was that a picture you took when it was new?

[Andyuk911]

Nope, couple of months back .. it is easy to clean ... there are lots of products. I have an 'orange' one from chemical guys(Heavy Duty Orange Degreaser 16oz) and there is the Autoglym one which I have used.

http://www.halfords.com/webapp/wcs/stor ... yId_165713

There might be a discount code on DW1 if you look (http://www.carwashnwax.com/)

Back on topic .. I have just sent an email to the above company to see if they have a UK rep.

[sonny]

Ok be intrested to hear feed back from the company, and yea hell of a clean engine bay there!

[pippyrips]

I spoke to John at Thorney Motorsport today thanks to Andyuk911s tip-off (thanks Andy) and sent off some of the pics that have been posted on here. I'll hopefully hear back with some more concret details tomorrow. First impressions are promising though and John clearly knows his stuff.

I've already heard back from some other people who quote cira £200 p&p for the the intake manifold to be sorted as AntoRS4's though thats assuming you have a spare lying round!

[silverRS4]

So do you think you'll have Thorney do the work? It would be great to see how they approach the work. I will be ordering a spare manifold and doing the work myself. I've done quite a bit of gas flowing for various race heads and manifolds with good results and I have the tools (and time at the moment - which is helpful). The RS4 intake is a great piece to start with. I will perform a before/after dyno pull, and at the same time do a before/after mass-air flow in gram/sec using VAGCOM. This will help correlate the improved air-flow capacity to any power gains (hopefully).