I got a free Turbo II throttle body and surge tank assembly (year unknown) from a fellow FC autocrosser over the weekend. I was initially just going to remove the thermowax from it in case the thermowax on my N/A S4 was bad, but then I figured if it were bigger I could swap the TB into my car over the winter as a small power upgrade. Anyone know if there is a size difference between S4 N/A and S4/5 TII TBs, and if TII TBs will bolt onto an N/A engine without modification?

Search came up empty-handed and I'm not in a position to remove the TB from my car for measurement.

 

It's not any bigger, and besides that it mounts upside down. The TB is not a restriction, so going bigger would not result in more power anyhow.

 

I've used a n/a TB on a T2 so I would guess they are the same save for the idle screw.

 

Thanks for the replies. I don't have any other need for it besides (maybe) the thermowax, so it's no biggie if I can't use it, esp. if it's the same size as the N/A TB.