Definitely a typo. The largest throttle body available for an LS1 is the 94mm that we carry. That won't bolt up to the factory intake, but will to some of the aftermarket units as well as our twin-screw supercharger set-up. There's really no reason to go above an 80mm on the stock intake due to the size of the mouth of the intake. On LTx motors 54mm was the largest you could go. For the 58mm throttle bodies you had to bore the front of the manifold, and for the mono-blades you had to port machine/match. You can't do that with the nylon intake, particularly because of the EGR design. The shape of the gasket, even on the non-egr LS1/6s limits the bore capability even if you do figure out a way to sucessfully machine the nylon.