So apparently the turbo and na engines have a different air pump, and the belts are much different as well. Does anyone know the size of the turbo air pump belt? The one they have on file for both AutoZone and Napa are the size of the na belt and they don't have record of the turbo one, although I'm sure if I had a measurement they'd have the right size for me. The one I have is 37.5 inches and that's the one they sell. If nobody knows i'll probably go there and get one that's like 4 inches shorter and try it and if it doesn't work i'll return it and try a different size

 

actually it looks like maybe the jspec air pump is completely different than both of these, the adjusting bracket is on top of mine and in the pics in the factory manual they're on the bottom or bottom right side on the us spec ones. So unless anyone has any idea i'll probably try to measure it and see what they have that's close.

 

no idea on the jspec pump sizing since that is an oddball pump to run.

there is no difference between USDM n/a and turbo pumps aside from the outlet pipe on the back of the pump so they both use the same belt.

 

I'll get you the part number for the belt I have for my J-spec air pump. The pulley is smaller diameter than the US version, so I had to just test fit a few belts until one worked.

 

Goodyear 15371, 36.5" long: http://www.summitracing.com/parts/GTR-15371/