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Stumbled across this on the net .... enjoy

http://www.uk-mkivs.net/blogs/uk-mkivs_ ... 00517.aspx

Hi,

I put them in the other day and they ROCK !!! I had to use the Yellow spring tho as the green one it comes with isn't strong enough for 1.65 Bar Boost.

Compared to their piston valves the new valve is much quicker and softer. The car hangs much nicer on the throttle if that makes sense. Also they are nice and small making install and change of springs much easier.

Dave Out!