Mugen twinloop DC2R & EK9 How to spot the difference?

[mnc]

As title states. Kinda confused

[90LAN]

well u measure the lenght of the axle back

ek9 will be shorter

b pipe is the same

[mnc]

oh alright because i bought one from a trader on this forum and i reckon i got the wrong axle back.
its kinda shorter and it sits low even when tweaking the rubber hangers.

This picture which i borrowed from a thread on here, the tip sits flush.
http://i858.photobucket.com/albums/ab146/mnc1408/1264461014.jpg

Where as my one the exhaust hits the top way before it can even get its tip that close.

=/