Originally Posted by woodlands1

I checked out the thread on MB World that was referenced above.

The guy doing all the mods to his black 4 door 320 AMG sure is a gluton for punishment. If you take the time to read thru the entire thread (13 pages +) you will find he must have dropped a ton of money and effectively got nothing out of it. In fact, it doesn't seem that his car runs as good as it did before all the work.

I'm of the opinion that it isn't very easy to squeeze any big HP gains out of the XFire NA and SRT-6 engines in spite of everyone's wishes.