Now discontinued.
Please see Tial MVR:
High temp NiCrFe based alloy is used for valve and 347SS valve housing will offer longer product life compared to competing designs. 17-7 PH Stainless Steel actuator spring gives consistent pressure at high temperature, resist "relaxing" at temperature to 900F (483C). Comes with all flanges and hardware. The ONLY way to guarantee rock solid boost! PROBABLY THE CHEAPEST IN THE UK!!