Called Weiand today.

the x ellerator is just a gimmick for marketing, the 2 are if not the same dimensions, close.

See...single planes were a racing deal, once the the game changed on the street/manufacture comp, they became the x ellerator.
heck for a while it was the trend for knot heads to buy 'race' parts and throw'em on there mills with hopes of ricky bobby glory on the streets. he he