Gta liberty stories Mission #13 Don in 60 Second

The 13th mission in the storyline is actually "Don in 60 Seconds," and the mission you previously asked about (No Son of Mine) is the 11th. It is possible you are thinking of the "Disruption" prep missions from GTA Online (Cayo Perico Heist) or a mission with a similar theme of sabotaging rivals.
Here is the description for the actual 13th mission in Liberty City Stories:
Mission #13: Don in 60 Seconds
Given by: Salvatore Leone
Location: Momma's Restaurant, Saint Mark's
Reward: $1,000 + access to the Leone safehouse
The Plot
After surviving the hit his mother put out on him, Toni meets with the Big Boss himself, Salvatore Leone. Salvatore is impressed with Toni's loyalty but has no time for pleasantries—the police are currently raiding the restaurant. You must get Salvatore out of the area safely.
Mission Objectives
Escape the Raid: Immediately get into the four-door car with Salvatore.
Lose the Heat: You will instantly have a 2-star Wanted Level (which jumps to 3 stars if you aren't quick). You must drive Salvatore to the Pay 'n' Spray in Red Light District.
Deliver the Don: Once the car is resprayed and the heat is gone, drive Salvatore back to his mansion in Saint Mark's.
Strategy Tips
Speed is Key: Don't hesitate at the start. The police will swarm the restaurant quickly; if they block the exits, you'll be trapped.
Avoid the Bridge: Don't try to cross into Staunton Island or head too far south; stay in the Portland area to find the Pay 'n' Spray quickly.
The Reward: Completing this mission officially introduces you to Salvatore as your primary employer and moves the story forward significantly.
Are you thinking of a different mission?
If you were looking for a mission involving "disrupting" a business or gang, you might be thinking of:
"Sindacco Sabotage": Where you defend Leone's territory from Diablos.
"Triad-n-Error": Where you disrupt Triad operations for Ma Cipriani.
"The Whole 9 Yardies": Sabotaging the Forellis by leading them into an ambush.