Okay, here's my glitch story:
I bought an El Camino, changed the oil and gave it a wash, put on a set of +1 American Racing Torq Thrusts, and bought a few performance upgrades (ECU, intake, sport muffler, sport cat, soft racing suspension and twin-plate clutch/flywheel).
When I'm done adding those parts I go to my garage to take a look at it...and see that it has sprouted a set of C2-Corvette-like side exhaust pipes. Blech. Figuring they're the result of the upgraded mufflers, I uninstall the sport mufflers in the settings menu for the car in the garage. Back to the Garage top menu...it still has side pipes. I try removing the other exhaust and intake parts. No change. Remove all upgrade parts except the wheels. No :censored:ing change.
My questions are a) where did they come from and b) how do I get rid of them (assuming there's a way to do so)?