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First question is why? A stock engine does not need it. I know Gene Berg and my engine builder and my mechanic and I do not agree with the secondary cooler getting its input from the main cooler. The best system, if it's needed, is to use a full flow system like Nathaniel did. Second, where are you going to mount it? Going up front is very good as you get max air flow through it but the down side is you have a lot more oil in the system and you have to run the oil lines. Porsche 911 places their cooler inside the right front tire well, behind the headlamp assembly. It gets great air flow but is also aerodynamically engineered so don't try this at home unless you are educated in the art :) The plain coolers are just a couple of loops in bare tubing. Just running to oil to and fro is enough to lower the temp several degrees. Replacing the tubing with a real cooler (the 6-pass is not as efficient as a radiator style cooler like the stock unit) lowers the temperature even more (as is found in the Turbo model). Airflow is important. If the secondary cooler is mounted so ground air is routed into it this could be a problem when the cooler needs it most. When the weather is hot, like summer in the lower US (Arizona, Nevada, Texas, Mexico--oops :) the asphalt is pretty damn hot...and now the very hot air on the surface of the asphalt is being forced through the cooler? I doubt there will be a big temperature drop, if any. Placing the cooler in the direct airstream, like where most water-cooler engines place their radiator, is a good spot (just protect it from road debris). I have been contemplating, off and on, for over a year about whether to install a secondary oil cooler and where I would place it. Yeah, to me it is a big deal. Gene Berg is *probably* correct on the Type I not needing additional cooling so long as the compression ratio remains (very close to) stock. But he didn't do much research on the Type III (or IV) so we are the research facility. Our cooling is different and more strict (we can't easily change pulley diameter) and I don't see having a secondary cooler bad so long as it's engineered correctly -- I just haven't observed a Type III that's hit that 'sweet spot' yet :) Toby Erkson air_cooled_nut@pobox.com <-- Please use this address for email '72 VW Squareback 1.6L bored and stroked to 2.0L '75 Porsche 914 1.8L, ORPCA member Portland, Oregon, http://www.geocities.com/MotorCity/8501/ >-----Original Message----- >i was thinking about buying an aftermarket cooling system.