Any thoughts on the mods that have been done to this Boxster?
 

Does this car seem like it is stock? Obviously from the sound something is different and his top end is 175mph! Any ideas on how to get there?

https://www.youtube.com/watch?v=f5HUQ3ntg_M

It doesn't seem like he is getting good gas mileage driving like that.

Entirely stock except possibly for exhaust (could be PSE or aftermarket, I can't tell).

Using a manual stopwatch, I measure 0-60 in 5.8 secs. Porsche says 5.7 secs for the stock 2004 3.2L S model. Close enough for manual timing from a video.

Same for max speed; video indicates 175mph whereas Porsche says 165mph. We all know that the speedometer reads just a tad fast so it seems close enough to the expected stock performance.