Why is my car so loud and slow?

I have a 96 Honda odyssey its a pretty old car but its my first car so I wanna get at least another year or 2 out of it the engine is fine but the car is so loud and when I go 35 down a road it feels like I'm going 20mph, I got the car like that as it was a gift so I could have my own car but I just wanna know is it worth even trying to get the loud noise fixed an maybe make the car go alittle faster? Or should I just go lease a newer car?

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