IE v1 plus Majesty FMIC

Stock Location vs Front Mount


Whether or not stock location intercoolers are superior to front-mounted intercoolers is a popular discussion topic.

Mk7 GTI Intercooler Evaluation
Mk7 GTI Intercooler Evaluation
Candidate Intercoolers for Bicooler Use
Candidate Intercoolers for Bicooler Use

I’ve used a few models of each version with my GTI and logged some information that gives some insight into how the two products compare.

Data collection:

My GTI operates with a Shuenk IS38+ turbocharger and alternates between two custom tunes, a 93 octane tune from EQT and an E30 tune from Stratified.

Both tunes operate with similar boost profiles.

Intake air temperature is the variable of interest since it is the product of the intercooler cooling the compressed air from the turbocharger. The difference between the intake air temperature and the ambient air temperature is calculated at 6,000 RPM during a full-throttle third gear pull.

Wagner Intercooler Temperature Curve
Intake Air Temperature and Ambient Air Temperature

The IAT above ambient has been measured a number of times for the following intercoolers:

Stock Mount

  • Unitronic
  • APR
  • do88
  • CTS
  • IE V2
  • Wagner
  • IE V1
  • HPA
  • AMS

Front Mount

  • Neuspeed
  • ARM
  • JDEurosport / Treadstone-*


Combining the data points for the stock location intercoolers provides 126 individual observations.

Combining the data points for the Neuspeed and ARM front mounts provides 15 observations.

* Note: The JDEurosport Treadstone TR8L front mount is being omitted from this comparison because the TR8L is designed for low pressure drop with the compromise being, according to Treadstone, “low cooling efficiency. I don’t believe the TR8L is well suited to the Mk7 GTI.

Summarizing the two data sets into box plots leads to the chart below:

Stock Location vs Front Mount Intercoolers

There is a high degree of overlap indicating that the “average” temperature rise during the third gear full-throttle pull is unlikely to be meaningfully different between a stock location IC and front mount IC.

To account for the variance in the recorded data a t-Test is applied to the data observations. The null hypothesis is that there is no difference in the stock location and front mount average temperature delta.

The t-Test result supports the null hypothesis, there is no statistically significant difference in the means of the data sets.


A number of different intercoolers have been used on my GTI and a large amount of data was recorded using them. Analysis of the measurements does not show any significant difference between the intake temperature delta of the stock location intercooler and front mounted intercooler following the data collection method described above.

2 thoughts on “Stock Location vs Front Mount”

  1. Have you tested IATs on a twin cooler set up? Is it beneficial? If so would you need to get a custom tune to get the full benefits of such thing. I’ve heard some people say its useless but I’d love to get your input. Thanks!

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