Two Manteca tire shops and an automotive audio shop were all victims of a slick maneuver by an alleged con artist who made off with some $16,000 in merchandise over the last two weeks.Manteca Police patrolmen made a car stop on Union Road at Sapphire Way at about 1:15 Wednesday afternoon and arrested 17-year-old Cyrus Ashford of Hayward on fraud charges. An older man in the vehicle with the teen was released at the curb because his association in the crime was considered not provable even though he had been videotaped on security cameras carrying audio equipment out the front door of a Manteca store, officers said.Professional Auto Stereo and Security, in the 400 block of North Main Street, was the most recent business to be victimized Thursday noon, minutes before police located the suspect’s 2003 GMC Savanna van. The loss amounted to over $4,000 worth of stereo equipment including four channel power amplifiers, speakers, coaxial two way speaker systems and woofers.Stereo shop owner Alex Zideh said the men were in his store for about 45 minutes Thursday as they selected the various items off of the shelves and placed them on the front counter.Zideh said he is accustomed to customers trying to bargain on price, but that was not the case Wednesday.