What are the advantages of using bigger exhaust pipes on my Toyota?

Larger exhaust pipes can make the system more efficient and less restrictive. This allows the engine to push the gases out more easily, without that much restriction that are common in smaller stock pipes. The size of the exhaust pipes should, however, be compatible to the vehicle. It should match the requirements of the engine and the specs. You shouldn't just get the biggest pipes. Instead, shop for performance exhausts that are designed to optimize the exhaust flow and scavenging in the system according to the exhaust design and specs of a particular Toyota model and year.

My Toyota Cressida has a punctured tire. How will I know if the tire can still be repaired or if it would be better to just replace it?

The damaged tire is no longer up for repair and should instead be replaced if the puncture measures more than ¼ inch or 6 mm. If there's damage beyond the repairable tread area, tire repair would not be the best option. Check for pre-existing or improper repair and for wear on the tire's treads wear indicators. If there's wear to the 2/32 inch or 1.6mm remaining tread depth in any area, then you must go look for a new tire replacement instead.

Would a patch be enough for repairing a punctured tire? Would this work?

You shouldn't just use a patch for tire repair. This wouldn't be enough. You'll also need a plug or stem to fix the tire properly. Apply the patch to the inner part of the tire. Other than the patch, it's important for the hole to be covered with a plug or stem filler so that pressure won't be lost. This will also help prevent contamination. To properly repair a punctured tire, the tire must be removed from the wheel. By demounting the tire, you can do proper inspection. Check the interior for any form or sign of damage in able to fix it.

When I took a closer look at my tires, I found wear on the inner edge. I also noticed that the steering wheel isn't straight—it's a bit off the center. What could have caused this? What should I do?

Get the measurements from different alignment angles. This will most likely tell what kind of adjustment should be done. The inner edge wear is typically caused by excessive toe-out. This will be noticeable on both tires on that axle. If the steering wheel isn't straight, this could mean uneven adjustments. More adjustments could have been done on one trackrod compared to the other. This is typical when only tracking, an across the axle check of total toe, has been done. In this case, only one angle is measured, as opposed to the four-wheel alignment that measures more angles.

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