What kind of mileage are you expecting and what are you getting? The average for tC's on Fuelly is 25-27MPG. If you're getting 34, you're already doing pretty good.
I wouldn't replace a working intake or exhaust (or most parts) in the name of saving money on most vehicles. The mileage improvement is usually small, if there is any.
Along with the others, I highly recommend a Scangauge or Ultragauge. Even more so with the grill block. Watch the intake air temperature and engine temperature to make sure you don't cook anything. It also helps you see how efficient you're driving. You may find out that something you do is actually hurting your mileage. One example is accelerating too slowly. Unless you know you'll have to stop soon, accelerating a little quicker is usually better.
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