I have the classic system and have mine installed under my passenger seat. Put the harness where the factory ECM went and then fished the wires under the carpet to the hole GM stabbed for non-existant passenger power seats.
My buddy (northerngn) is about to pick up an XFi unit on my recommendation and is undecided on where to put it. I have only seen the XFi unit out of a car, never installed. I think its bigger than the classic but thinner, if it fits under the seat I still say he should put it there but he (and I) are looking for other ideas.
Keep in mind this will be a street driven car that goes to the track, not a race car so mounting it on the dashboard is out of the question.
For starters, here is how my classic sits.
The laptop gets buckled in and sits nicely shotgun during races (my car sees a lot more track time).
Any pictures of XFi installed on street cars would be appreciated.
My buddy (northerngn) is about to pick up an XFi unit on my recommendation and is undecided on where to put it. I have only seen the XFi unit out of a car, never installed. I think its bigger than the classic but thinner, if it fits under the seat I still say he should put it there but he (and I) are looking for other ideas.
Keep in mind this will be a street driven car that goes to the track, not a race car so mounting it on the dashboard is out of the question.

For starters, here is how my classic sits.


The laptop gets buckled in and sits nicely shotgun during races (my car sees a lot more track time).

Any pictures of XFi installed on street cars would be appreciated.