I finally found Exhaust here in HK today over in Mong Kok. The boxes on display are mostly already gone (pre-ordered) but of the ones for sale - he's not cheap at all by HK standards compared to the other MP cars. Also saw one in a display case out of box modified with gundam pens and have to say he doesn't look nice at all so I feel for those who had to endure a modification they didn't get a choice of.