[Terryk]

All these years now I have not understand why there are two different codes from Sachs for E90 M-Tech editions models.
The Sachs 311403-4 are for standard chassis
while
the Sachs 311405-6 are for M-Tech sport chassis.
But
the manufacturer provide also the
311407-8 again for M-Tech sport chassis!
Usually, the last pair 311407-8 is more expensive from the 311405-6.

Does anyone know the real "physical" differences between these two offered pairs? or it is a market trick for "newer" lci models but with no real difference?
(Obviously, the 311407-8 might be for later models but I strongly believe that there were no differences between the years in E90 critical suspension parts (i.e. changing physically a shock absorber might needed a change of its top mount but these remained the same).

Many thanks.

[cdti]

Sorry I cannot help you with your question but do you know if the MSport dampers were the same across the E9x range?

[Terryk]

i am not sure, try www.etk.cc and check through it if there are different codes for ie E90/E91 and E92/E93. it might have different for E93 as it is heavier but i don't believe so. this is something that has to do with the springs and that is why there is a variety of different springs throughout the E9x range.