Atleast 5K???
My buddies old Cobra:
501rwhp 528ftlbs
Custom Home Ported Eaton
Custom Ported & Polished TB and Plenum
Custom 2lb Lower w/ Stock Cage
2.8" Pulley
Stock motor/Stock Fuel Pumps/Stock Injectors
So like a $100 pulley and a tune hahaha.
Edit: He had Mac Catback Exhaust as well. So add on $1000 just for the sake of being on the high side(Pretty sure its like 1/2 of that retail but I dont feel like checking haha).