Determining the intercooler flange size is required before ordering your Riffraff Diesel Intercooler Boots. The intercoolers have different configurations, so you must verify the size prior to ordering. This is an easy task and only takes a few minutes.

First, Some Important Info:

There are two sizes of flanges: 3” x 3” and 3” x 3.25”. You must measure both sides to make sure you get the correct boots. 

 

There is a passenger side intercooler boot (cold side) and a driver side (hot side):

The passenger side intercooler boot is located under the degas bottle (fig. 3 - degas bottle removed).

The driver side intercooler boot is located under the air intake snorkel (fig. 4).

 

 

 

You can measure your boots in several ways.

1. Using an outside diameter caliper. (fig. 1, fig. 2)

2. Wrapping a string around the boot and comparing the  length difference.

3. Or you can make a simple go/no-go gauge to slide over the boot flange.