I decided to put this thread under this section rather than the K&N lean bla bla bla.
To start with, I haven't done this in my Magna simply because I not having a problem with my present set up. But I did this with my Mitsubishi Cordia with turbo engine.

I made this mod years back when I tried to increase the boost of my car, naturally you must also enrich the fuel to avoid detonation. As I expected, it worked well.
I believe this simple and cheap modification will also work with any car that uses variable resistance.

This is an article from Autospeed.
http://autospeed.drive.com.au/cms/A_1659/article.html

I hope this will fix the lean problems.

Typo error: Modification