Depends on what you mean by "bolt on". A stock LS2 should pull a stock Mustang. If it doesn't the owner is a retard.
Showroom Stock LS2 (2005 -2007)
12.215 @ 115.45 - LS1LT1 - 06 A6 - (1278)
12.235 @ 115.58 - 06C6FVR - 06 M6 Z51 - (333)
12.290 @ 114.29 - Proney - 07 M6 - (4500)
12.314 @ 114.82 - CYA Vett - 05 M6 F55 - (675)
12.422 @ 113.90 - DrRichie - 05 M6 Z51
12.499 @ 114.90 - Jschindler - 05 M6 Z51
12.53x @ 113.00 - Wicked07C6 - 07 M6 Z51 - (914)
12.540 @ 113.59 - Tony 63 Vette - 06 A6 - (1510)
12.548 @ 113.74 - Tony96LT4 - 06 A6 Z51 - (1149)
12.56x @ 113.39 - Red Sleeper - 06 A6
12.56x @ 112.00 - Orange C6 - 05 A4 Z51 - (56)
12.650 @ 111.65 - Zippin Zee - 05 M6 Z51 - (48)
12.665 @ 113.03 - Mdrrandall - 07 M6 Z51 - (1675)
12.693 @ 114.88 - Prankster - 06 M6 - (1621)
12.69x @ 112.32 - Silverlx - 06 A6 - (872)
12.703 @ 112.43 - Jelsis - 06 A6 Z51 - (452)
12.70x @ 113.00 - Blackmajik - 07 A6 - (1627)
12.71x @ 111.30 - Flyin05 - 05 M6 Z51
12.71x @ 111.00 - Demented - 05 A4 Z51
Based on your times there, that honestly looks like a driver's race to me. Stock 5.0s are in that same wheelhouse.