Respons TMS is the best BOV on the market. With quick and easy venting bias adjustment and the valve to use when wanting to achieve noise on a car that is sensitive to atmosphere venting e.g. VAG applications

Advanced TMS benefits
Spring pre-load adjustment for maximum response
Available as universal or direct-fit kit
Venting configurations :
. full progressive bias adjustment from recirc (silent) to atmosphere (loud)
. bias adjustment done manually via cap ring
. can be locked off in full recirc mode for legality purposes