NC had a few shops that got hit hard by the feds due to deleted and related tunes recently. Fines are in the millions. Not many places are advertising this type of work as it's a Federal crime to modify or delete emissions items...even if it does make them more reliable and more efficient.
Also your title says in NC and your posting says Greenville SC, those two Greenville's are no where close to each other. Makes it sound like you're a fed....and not a very good one if you can't keep your locations straight(not sure there are many good feds when it comes to three letter agencies). No offense if you're not a fed, my posts are riddled with typos thanks to phone made posts.