The dealer/XPart upgrade is simply an ECU remap. No parts are changed. I understand these are now available again from XPart, although perhaps a bit pricey.
Synergy 2 will work on both the 115 and 135 versions. Both will have increased bhp/torque, but obviously the 135 will still be ahead of the 115.
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Steve
2004 MG ZT+ CDTi 160 (sadly now gone!)
2015 BMW 435d GranCoupe XDrive
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