Id pass on the hood stack unless you want soot all over your cab and windshield... go bigger with a 5" system and find you a good muffler or something to make it louder.. my 5" system is pretty decent straight piped..
That will help your sound and performance if you dont have an aftermarket downpipe and they are not too expensive. It is definitely the best thing to do to your exhaust. After that, if your still looking for louder, go to 5"
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