If the bottom of the I/C is above the swaybar and the scoop drops down below the I/C it is stock.
If the bottom of the I/C is lower than the swaybar it may be a stretched unit, but they usually have a 2 1/2in inlet with a stepped hose connecting to the turbo.
Most early stretched I/C's were 1 1/2 stockers welded together (15 rows vs. 10 rows).
That is a nice looking I/C.