what would be best for my daily truck?

1 or 2 units with headers and duel pipes?

myself I wont go the cheapest but don't want the most expensive either so middle range on price is what I am looking for but also want it to work good and last. I have read about a lot of them failing but seem to be on the lower end of price range for them.

are they really that good for fine tuning in a carb?

skool me plez.