From the head, it looks to resemble that of the 00 series, mainly the Exia. The antenna is only the V shape.
The only variant of Exia I know of is the Avalanche
. It's too bulky to be it though so I did a bit more digging.
The closest I found a 00 Gundam variant
, but there's a problem of it not possessing 2 GN-Drives so... I'm baffled. What criteria did you enter to find it?