CP-E intercooler upgrade. The CP-E core has a volume that's around double the volume of the stock core, and is more efficient as well. Cast end tanks make for smooth flow in and out of the core. The kit also comes with an additional oil cooler, which is invaluable if you're going to run the car at the road course.
We followed the instructions CP-E includes with the kit, and everything fit together nicely. Note that plumbing clearance is very tight on a car equipped with an automatic transmission (like ours is), since there's an extra water-to-oil transmission cooler that's not present on the manual-trans cars.
You've probably noticed the CP-E logo on the intercooler core. I wasn't super excited about the logo -- not that we don't love the guys at CP-E! -- but decided to fit the core up and see how it looked before doing anything drastic like removing the logo or spraying the core black. It turns out that you can hardly see the core OR the logo when everything is back on the car. If you are REALLY looking closely -- like crouching down and putting your face right at the bumper -- you can see the logo. Otherwise, you'd never know it's there. So it'll stay. If anything, it's kind of nice because it's an indicator the intercooler core is not stock, if someone does end up peering in there.
We did some minor trimming of the plastic vanes on the inner bumper plastic to make installing the oil cooler easier, but we didn't have to cut or trim any of the outer bumper skin.
Once done, we strapped the car back on to the dyno and ran it. We gained another 15 hp and 21 ft-lbs of torque.
We're very happy with the results from the intercooler upgrade, and with the fit and finish of the kit.
The massive power gains we've achieved at each stage of this project are addicting. We're now considering a full turbo-back exhaust, despite our earlier vow to keep it stock...
In other news, the AccessPort now works on all 335i models, including 2007 model years. We expect to hear soon about the latest maps, which will include Stage 2 maps for cars with full exhaust systems. We also expect the release of the Cobb ProTuner software, which will allow us to develop custom maps here at Mach V Motorsports.