http://www.zentrum.co.uk an honest, reliable and affordable car specialist Tue, 14 Jun 2011 09:55:00 +0000 http://backend.userland.com/rss092 en  Nitrogen molecules are bigger than oxygen molecules they do not pass through the microscopic pores present in the tyre walls, thus maintaining them at the right pressure for periods 3-4 times longer. Given that nitrogen does not contain oxygen it does not oxidise the metal rims of the tyres or ... http://www.zentrum.co.uk/uncategorized/zentrum-porsche-a-specialized-centre [gallery]Our Porsche remap & performance chip tuning procedure allows us to modify the data onboard the ECU to give you better performance, better mpg & an all round better drive.. The procedure for remapping your Porsche model (post year 2000) involves a 'read', 'modify' & 'write' process to & from the ECU via the OBD/OBDII port. ... http://www.zentrum.co.uk/uncategorized/block-exemption