So - which one...

[chipsonfriday]

http://www.sol2.be/Performance/ENG/Home/page.html


https://www.motorworks.co.uk/vlive/Shop/Parts.php?T=5&NU=15&M=90&Ct=EN&SbCt=BA_15_90_EN_75




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[chasbmw]

The booster plug because it is temperature compensating


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[andylel]

I have a booster plug available if you are interested. They are very good and as previous poster says they are temperature compensating.