Borla exhaust kit
Not sure why, but for the Borla exhaust kit for 67-70 Mustangs with 351w is pretty much half off if you order straight through Borla. Must be coming out with something new or just didn't sell enough. Still fairly pricey at $550 plus shipping.
Here's the link:
1968 Mustang coupe 5.0/T5
Current Project: 1968 fastback 351w