DIY: Custom Cold Air Intake for GReddy Turbo

Derrian · Mar 9, 2011

Credit: Rotary Insider
Link: http://www.rotaryinsider.com/diy-tac38/home-made-cold-air-intake-gap32.htm

The Greddy turbo kit comes with a worthless foam filter that sucks in hot engine bay air. I've seen coolant temps at 190 degrees, and intake temps around 140 degrees while driving at a 70 mph speed. If we were to relocate the intake to the outside of the bumper, we would have access to much cooler air - dropping intake temps by up to 50 degrees.

So I bought a 90 degree elbow and a 3" metal pipe (6" long), and connected it to the greddy MAF connector using a 4" long 3" wide silicone hose.

Here is the intake, with pipes already connected. I cut up my old K&N intake and used the rubber part that used to connect the filter to the MAF, to help support the intake through the pass through into the bumper. That way the intake doesn't bounce around or move.

Even though the radiator fans blow hot air, air flow will cool things down. Thus I removed the OEM intake bottom, and allow the radiator fans to blow air into the engine bay and give the engine and pipes air flow. While it might seem counter intuitive, I've been able to touch the pipes after hard driving, and they were just lukewarm.

Finished product:

Prices: $20 for the silicone hose, $10 for the elbow, $10 for the pipe, and $35 for the intake filter.

After a few days, I decided to redo my intake. The large intake required a 90 degree elbow, and the filter was far too large to fit in the space provided. I had to remove the bumper rebar to get it in place. Since the rebar is there for crash protection, I wanted to put it back in place.

I had a spare oval shaped K&N filter lying around. so I redid the pipes and managed to get it all squared away without any elbow...