Tial Q Blow Off Valve (BOV)

Tial Q Blow-off valve. Newer version of the popular Tail 50mm valve. Uses same weld flanges. Specify Red, Blue or Silver and Flange material. Select the plain spring unless you know what you are doing, this is the typical required for most setups. For finicky MAF setups with the BOV near the MAF where leakage at idle is an issue, a stiffer spring will help.