Background: This post is a continuation of an investigation into an airbox modification on the stock Mk7 GTI airbox by cutting slots into the side of the lower half of the airbox. In a previous post, the effect on airflow through the air intake was measured. The slots were shown to provide a small increase […]

Three intercoolers I’ve hung onto to conduct additional evaluation with are the APR, do88, and IE v1 stock location replacements. Each have been in the GTI for a period of time that has allowed for gathering more data. The data I presently use for comparison is generated from a full throttle third gear pull. The

In a previous post the subject of the Mk7 IAT sensor and how the readings can be deceiving was presented. A related topic is the occasionally asked question, “my IATs with the stock intercooler cruising around are XX degrees above ambient , do I need an aftermarket intercooler?” Cruising around refers to the condition where