This throttle spacer is CNC machined in house from 6061 aluminum plate and features a 1/8 NPT tapped hole for your choice of a water / methanol injector or a nitrous injector. These are high quality parts which are completely tumbled smooth and totally ready to rock and roll. This kit includes 2 OEM gaskets and 4 matching longer throttle body bolts-- Everything you need to get that project started without any drilling or tapping of OEM components. *Note* Only fits VW/Audi 1.8t vehicles. These spacers also have an additional advantage, by installing the jets after the throttle body, the extremely sensitive, and expensive OEM throttle body is protected from any water / fuel spray, which can contaminate the electronics portion of the throttle under high boost and cause malfunctions. Features .500" Thick Billet 6061 aircraft aluminum Totally deburred and tumbled for a factory like appearance Includes 4 bolts and 2 gaskets Must be used with Shut Off Solenoid Upgrade