In one sentence, describe what the following article is about: Once you've installed a new catalytic converter, one thing you'll want to do immediately is double-check to make sure there aren't any leaks in the exhaust system on either side of it. Depending on where it is, an exhaust leak can cause a variety of problems for your vehicle, including reduced fuel efficiency and long-term damage. There are several ways to find an exhaust leak. One is to simply be observant while you drive if your car sounds louder than normal when it runs or seems to "rumble" more, you may have a leak. You can also check for leaks by jacking your car up, starting it in park, and carefully moving a lit candle along the length of the exhaust tubing. Leaks which are invisible to the eye should cause the flame to waver or blow out. One problem that can occur in faulty catalytic converters is that they can become "backed up" with soot, debris, and other exhaust byproducts or broken apart inside the converter. In this case, the engine's ability to rid itself of exhaust is hampered, which can cause a vehicle's fuel efficiency to plummet and can even cause the engine to stall in severe cases. Luckily, performing a backpressure test is simple just screw a pressure gauge into the oxygen sensor's hole before the converter in the exhaust manifold in most vehicles. The pressure reading should be less than 1.25 psi when the vehicle's engine is running at 2,000 RPMs. The worse the congestion is, the higher the pressure reading can be. Very bad backpressure readings can approach 3 psi. If your car's converter is old and worn, one simple test can tell whether it needs to be replaced very quickly. Simply grab a rubber mallet (or similar tool) and give the converter a firm hit. If you hear any sort of rattling, your converter needs to be replaced this indicates that the metallic catalyst within has begun to corrode and crumble. However, if you don't hear a rattle, this doesn't necessarily mean that your converter works well. There may still be other problems with it. To be clear, this test can only tell you if you have a bad converter, not if you have a good one. Catalytic converters can be tricky parts if you're in doubt about whether or not yours is functioning properly even after performing the tests above, don't hesitate to take it to a mechanic or specialist. These professionals will have access to the type of equipment that can be used to perform more advanced tests, like delta temperature tests, oxygen storage tests, and CO2 tests. Most auto shops that offer smog testing will be able to perform these sorts of emissions tests.
Summary: Check for exhaust leaks. Measure back-pressure in the exhaust system. Perform a mallet test for old converters. Consider more advanced tests.

In one sentence, describe what the following article is about: Trimming straight across creates a pleasing effect, but it can also limit ingrown toenails. However, you can round off the corners with a file so you don't scratch yourself with your toenails. Trim your nails when they're dry. You'll get a cleaner cut. Pick out clippers meant for toenails, as they are less rounded and made to cut thicker nails. You may find that nail nippers work even better, especially if you have nail fungus, because they are sharper and easier to control. They look like small wire cutters. Skip cutting cuticles. They help protect you from infection. Your toenails should be about as long as your toes. If they're any longer, they may rub against your shoes. If they're too short, it can lead to infection. An ingrown toenail happens when the edge of your toenail pushes into your skin. You may notice your toe is red, some swelling, or some pain. To deal with an ingrown toenail yourself, bathe your feet in warm water for about 20 minutes, which can help relieve pain and swelling; acetaminophen and ibuprofen can also help with the pain. Place cotton or dental floss under the edge, to help the nail grow properly; put new pieces back in after each time you soak it. To keep it from getting infected, use antibiotic ointment and then cover the area with a bandage. It can also help if your shoes are loose-fitting or open around the toes. Proper toenail maintenance can help keep you from getting ingrown toenails, such as cutting straight across and keeping toenails at the proper length. You can deal with ingrown toenails yourself. However, you may need to see your doctor about one if you are having a great deal of pain. Also, redness moving up your toe or pus coming from the wound could be a sign of a more serious infection. Also, if you have diabetes, it's important to take action when you notice any problems with your feet. Run a manicure stick under your nails. Don't push too hard, as you can separate the nail from the nail bed. Running a manicure stick will help keep them clean and beautiful. While it's fine to use polish, you also need to take a break from it every once and awhile. Keep away from it about a fourth of the time, taking a week off a month. That will give your toes a breather and allow them to regain moisture. If you leave it on for longer, you can stain your toenails. However, adding a clear base coat before painting your toenails can help alleviate this problem. If you do have stained nails, check to see if they're also hard and brittle. If so, you likely have a toenail fungus. Ask your doctor about the condition.
Summary:
Trim toenails straight across. Cut toenails to the proper length. Watch for ingrown toenails. Clean under your toenails. Take a break from polish occasionally. Remove nail polish before 2 weeks is up.