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Keep the factory muffler. You'll appreciate the lower sound level in the long run. Plus it's an N/A factory motor, you won't get much from BWUAAAHHHHHHHHH.
Say you got a different muffler that has a higher flow but with chambers, I say do it, but its really not worth the gain, say on a car that is N/A. You really aren't letting too much go anyway.
If it were a N/A race car? yeah, it may help, but no, you won't need it. If it were a motor larger than an inline four? It will definitely help. But with an I4 ecobox, there's not much sense to do so.
I'm only saying this to save you from spending more on exhausts and all just for the sound. You will realistically just enjoy the quiet in the long run.
So save the money to find a good Cold Air Intake like Kiwi has mentioned.
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94Hilux-XCab-22RE-W58-8"V6
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