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you don't need to upgrade the muffler on the dohc's i would for looks but you don't gain any hp.....for sohc's it should be one of the first mods......untill you doa turbo you can stay with the stock piping too but i recomend getting atleast 2.5 piping or3'so the air can breathe better
even turbo cars stay with 2.5 until they are making serious power
lol thats why i said when you turbo iti should have wrote it a little better but thats what i meant...im not stupid even i hate people who get 3' for there n/a