so is it as simple as finding a core, welding some endcaps on, and plumbing it up? I know a lot of design and R&D goes into APR's and Racetechs and the like. But I wonder how much of that is the truth and how much is marketing mumbo jumbo. Anything I should look out for.

you want to maximize efficiency (max cooling, min pressure drop). There are a LOT of factors involved in doing so.

Buy Maximum Boost by Corky Bell

do you want the best, or are you willing to cut a few corners to save come cash?

there would be a closer to ideal design offered.

Since there isnt, the home brew concept with certain considerations in mind, I think will offer comparable performance.

Spearco cores with endtanks are available off of e-bay for $350-$450, depending on size. That's where I got my IC

It might not be worth all the trouble trying to make endtanks and welding them up.<ul><li><a href="http://cgi6.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewSellersOtherItems&amp;userid=boostco olers&amp;include=0&amp;since=-1&amp;sort=3&amp;rows=50">http://cgi6.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewSellersOtherItems&amp;userid=boost

My money is on Duh to be *the* setup for the A4 once Eric gets them done.

<ul><li><a href="http://www.are.com.au/techtalk/intecoolersMR.htm">http://www.are.com.au/techtalk/intecoolersMR.htm</a</li></ul>

I've seen the website and those things are HUGE. Are there any pressure drop issues due to the size? I don't claim to know much about such things but am always up for new info.

person. He's happy with it. But they still need to rebend some of the Pipes from the turbo to the IC and the IC to the intake manifold.

I think Duh's will be the k03/k04 option of choice... but above that...I dont know

Paul has 9 hot passes and is averaging 7 whp, I would like to see 15-20 whp on the production version for stage 3.

The S4/RS4 units are seeing 30 whp ave on K04s

Got an ETA yet? I'm dyin' over here! =)

They kept it 2.5" in to maintain velocity

sounds too big, the TB is only 2.5", and I think the turbo is either 2" or 2.25" out.