This is the orange version of "Gotta go Faster" flames shirt (with glitter) The blue version is on the My Gear Page.
TODO: port My Gear page http://www.sonicgear.org/MyCollection/MyClothingCurrent.html
At the right there's a shirt with the classic pose in front of Chris and the rest of the cast for Sonic X. This is a short sleeve, and is also known to exist in yellow and dark red as well as the shown blue. This is a common one.