Those laughing car guys on NPR are driving off into the sunset. Brothers Tom and Ray Magliozzi, the jolly hosts of the popular “Car Talk,” said Friday they will stop making new episodes of the auto-advice show at the end of September. The show airs Saturday mornings and is NPR's top rated program. Plans are to run repurposed versions of the show indefinitely. “We've managed to avoid getting thrown off NPR for 25 years, giving tens of thousands of wrong answers and had a hell of a time every week talking to callers,” Ray Magliozzi said. “The stuff in our archives still makes us laugh. So we figured, why keep slaving over a hot microphone?” “Car Talk” has tested out the repurposed show and is convinced they will work. There's a strong wish among NPR stations to keep the show going even if there isn't fresh material, Doug Berman, executive producer of the show, said. Berman said he knew the retirement was a possibility; Tom is 74. Still, Ray, 63, mocked him. “My brother has always been work-averse,” he said. “Now, apparently, even the one hour a week is killing him.” (The Associated Press contributed to this report.)