Id take it to buschur 100 times before slowboy. I have ordered things from shops like RRE and waited over 2 weeks just because I couldnt think of giving them a dollar even though I could drive there and pick a part up in one day.
As far as a daily tune Buschur should be fine though.
If he was going for a racecar I’d have someone along the lines as Evans tuning, Brad Brooks, or Tony Palo to do it right and make every ounce of power the setup has in it.