I have a 2001 Toyota Tundra V8, would a new exhaust system help it in any way?
To expand a little on the previous answer, it helps breathe easier because a new exhaust system is able to push more hot exhaust out. When air comes in to your engine, it mixes with the fuel and a combustion is created. The product of that is hot exhaust that is cooled in the exhaust manifold and then sent to your catalytic converter to sorta clean out and then through your muffler and out your tailpipe. If that tube is bigger and your muffler has less in the way of restriction, then a lot more air can come out. HOWEVER, a basic cat-back system is really not gonna get you much in the way of mileage or performance, but it's a good place to start.
If you got a performance cat-back exhaust, it would help the engine breathe better and would create a little more horsepower and less fuel usage.
I recently installed Gibson headers, high flow JBA cats, a Gibson cat back exhaust, a cold air intake and a throttle body spacer on a 2003 Tundra, The truck was dyno tested before and after. Stock was just under 200 horse power. After it hit 306. And my friend says his fuel mileage has gone from 16 M.P.G. to 19 around town. He also told me he has fallen back in love with his truck he can't wait to drive it every day. We did a lot of work but it was well worth it.
