For use on turbocharged engines. CNC-machined from 6061 aluminum alloy. Uses a large 1.98 in (50.5mm) valve. The V-Band design aluminum mounting clamp gives a very clean and unique appearance. An aluminum or mild steel weld base mounting flange is furnished with each unit. SS flange is extra.If you dont know what psi vacuum to use click the "view more pictures" link below the picture above! look at the info TiAL has provided and we have displayed.

THE PSI CHOICE IS PICKED BASED ON YOUR ENGINE VACCUM AT IDLE NOT THE BOOST YOUR RUNNING