Just taken my car off to have the suspension geometry set up and while it was in the shop noticed that both of the rear disks are the same sided i.e. they should be left and right disks but mine seems to have both left disks!
Guy in the shop said he was at the Nurburgring recently and noticed the same problem but on the front of another Exige…is this a common issue i.e. Lotus don’t bother to fit the correct disks?
Okay Wiki answers this
“The discs are not handed, so the same disc is used on the right and left hand sides of the car. The cooling air flow through the left and right discs is identical and the flow rate is purely a result of pressure differential between the centre of the disc and its rim; the shape of the vanes and the direction of rotation does not affect the flow rate significantly.”
AP ally bells are handed according to grooves and the vanes I believe 
So are EBC turbogroove …
I also noticed the vanes when fitting mine and discovered that they do not mirror each other wheras the grooves and dimples do…
In an ideal world the vanes would be handed but I don’t suppose it matters as the airflow differential would be minute !!
Contra rotating blades on high speed helicopters were experimented with to achieve equal blade speeds of their leading rotors… But our speeds are not up there with these machines so no need to worry !!!
All the standard lotus supplied discs are the same part number , not handed. As I understandit the EBC discs use the same configuration for the discs casting just machine the grooves to make them handed.
Only my opinion but that will make one disc cool facter than the other when doing spirired track work, so i ask wahts the piont of the ‘upgarde’
Some cheaper discs are actually handed, but without grooves or holes and in my opinion are actually better!!
Only my opinion, dont wish to start a bum fight!!
Oh the new 308mm one piece discs that I am supplying are handed and have holes!!!
The grade of metal used in the manufacture, is somewhat more important than the cooling grooves, imho. Also, I’d avoid drilled discs too.
There is a reason why AP & Alcon discs cost a bloody fortune…but they’re worth it.
I agree with Mr P, avoid drilled discs if you intend to track your car they crack badly 
Interestingly the front AP disks are handed but the rear ones which are obviously Lotus parts bin are not, but then again looking at the rear calipers I don’t think the rear brakes do a lot of the stopping anyway!
The Lotus OEM discs are not the best even on teh faster versions with 4 pots.
AP do a range of different discs (with differnt prices unfortunatley).
As said avoid the drilled ones. What did Lotus say about your aircon hose ?
Ex77