Can someone explain this to me?

[vwmk3jon]

Found this on ebay whilst scouting about. According to the auction, its needed if doing a m45 conversion but i have no idea what it is!!!

http://cgi.ebay.co.uk/eaton-m45-supercharger-mini-bypass-valve-polo-g40-mx5-/130388301954?cmd=ViewItem&pt=UK_CarsParts_Vehicles_CarParts_SM&hash=item1e5bbf9882

Much love

[hayesey]

it's essentially what the boost return valve on a g40 does.  Perhaps needed for an m45 conversion on some engines but a g40 already has a boost return valve.

[vwmk3jon]

Cheers chief

Thinking of buying a back-up charger incase things go tits up (as they always do! lol)

[Richg40]

I know I wouldn't buy a second hand one of these, dead common failure on Cooper S.