One of the guys in my club was looking for a Thunder Tiger engine back in December and sent an email to the company. He was told by Thunder Tiger they are no longer manufacturing glow or nitro engines. This is very disappointing since I have only used Thunder Tiger or Evolution in the past. I bought an Evolution .61NXT for the Mustang I'm building since I couldn't find a TT .61 Pro when I was putting together the items needed for the build.