I aim probably going to install side skirts if i find the time for it.
Arround a 2inch skirt. (would be for summer 2016
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For the diff story.
Thats probably a no go...
Prices ive got so far:
=> busines 1
asks 550 euro for the installation of another rear axle, but i need to bring that axle, and there are no garranties of al sensors and signals, spedo and so on works properly
2end hand axle starts from 800 euro to 1500 euro
Total price of 1350 to 2050 euro
=> busines 2
aks 2085 euro
Changes the diff gear ratio, gives garrantie that everything works right, even the speedo and odometer would work right (adjested to the change)
=> busines 3
says is no problem to do, but hasn't answerd back yet to know a price
=> busines 4
is the business that did my chip tuning and does all kind of mechanical adjustments like suspension, engine modifications, driveline changes bodywork, ...
No answer yet, but will be having one normally next week
Calculations are saying that if i drive 300 000km with my car, i have 180 000km left.
To earn the 2000 euro investment it needs to be a save of >19%
(looks not realy promising 
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Once i got answer back, if positive answer, then i will order this and some other stuff like relays and (a) switch(es). Then i have my coolant heater witch looks realy stock
