Found some headers online for 600 bucks wondering if i should put them on then my exhuast or just forget about? Don't they improve gas mileage? Or are they going to make my very quiet car sound to loud? if any one knows or has done this let me know will ya!

 

i m not sure if they will really improve mileage. it's like saying intake should technically improve mileage but it's more of a theory than reality.

a lot of gs430 and some sc430 people put on the headers (you can go to 2gs engine forum for more info) and they all love it. i don't have it though. it doesn't really make the car sounds much louder from what i heard

since the ls430 shares the same drivetrain, i would think the headers would fit?