The kit you are looking at for $924 on Summit's site is the standard version without the upgraded Black Tips. We list that one for $919 shipped. If you look at the Black tip Version on Summit's site they list it at $1,094.89 vs Stage3motorsports at $1,079.
2011-2014 SVT Raptor Corsa Sport Cat-Back Exhaust Kit - Part # COR-14387
2011-2014 SVT Raptor Corsa Sport Cat-Back Exhaust Kit (Black Tip) - Part # COR-14387BLK