Toulouse had raced out to a 11-0 half-time lead thanks to two Ramos penalites and a Jack Willis try.
But tries from Janick Tarrit and Jordan Joseph, both converted by Nolann le Garrec saw Racing take the lead.
Toulouse left it late to snatch the win, Spanish prop Joel Merkler Perez burrowing over from an attacking line-out maul, Ramos making no mistake with the touchline conversion and then kicking his third penalty four minutes later.
Bordeaux-Begles edged Montpellier 9-6 thanks to Maxime Lucu's three penalties to leave them second in the table on 37 points, two behind Toulouse.
Lucu's halfback partner Matthieu Jalibert announced after the victory that he has signed a contract that will see him stay at the club until 2028.
Jalibert, who has played 127 games for Bordeaux since making his debut in September 2017, received a standing ovation from the 32,000 crowd at the Stade Chaban-Delmas.
Bottom club Vannes notched up a morale-boosting 23-14 victory away at La Rochelle.
Pau put Lyon to the sword, running out 29-15 winners, while Clermont crushed Castres 54-10.
Perpignan host Toulon in the late game, while Bayonne entertain Stade Francais in Sunday's match.
