The Nemo throttle body is similar to the stock throttle body with the exception of a larger bore and blue throttle plate inside. The stock throttle body has an hourglass shape inside the bore, and a maximum diameter of approximately 52mm. The exact measurements of the stock throttle plate were not measured, but they were significantly narrower.

The modified TB has a straight bore of 56mm, and the throttle plate has been replaced with a larger blue anodized version. The bore can't be made any larger and remain round, two vacuum passages will be compromised and then who knows what will happen. There is a number stamped on the side of both throttle bodies, and they don't match. Perhaps they are a serial number. Both throttle bodies were cast by Weber, a well-respected name in fuel-management.

Installing the throttle body is very easy, it took a full 10 minutes the first time, around 8 minutes after that. Only two things about the installation really deserve special mention. If the gasket is like a rubber o-ring then it doesn't have to be replaced. In order to fully utilize the potential of the throttle body, the intake manifold hole should be enlarged by 2mm to match the TB's 56mm. For the following experiment this was not performed because the TB was being tested temporarily.

In the lower rpm range the car feelt a little jumpy, but after a few miles the driver's throttle application was adjusted enought o prevent the car from bucking at low speeds in first gear. That same jumpiness also makes the car a lot more fun in third and fourth gear where it shows itself as instant throttle response. The formal testing was performed at WOT (wide open throttle), however the TB effects the partial throttle response as well. The modified TB will help a car with the stock intake at partial throttle, but it's effects are diminished by the restrictive intake at wide open throttle. The addition of a Kirk intake to the stock TB makes a measurable improvement, but the combination of the Kirk intake and the modified TB improves peak acceleration in first gear by 10% and in second gear by 11%.