I have here a year or so old Forge bypass valve. Works fine and does not leak. I have the yellow and blue springs for it, so it should be fine for anything but a 28psi+ car. It is flanged for a TMIC. It is a bypass valve not a blowoff valve, but it does make a sound exactly like mario getting a coin in super mario brothers when it bypasses under high loads. other than that its pretty quiet. $100