You're asking for the difference between the 7th generation Impala Base and Impala LS. Differences are in the looks, engines, and options.
Looks: Different front bumpers - LS has the fog lights while Base does not. Spoiler - LS comes with a spoiler, Base does not. Wheels - LS usually comes with alloys, Base is usually had with the hub caps. Interior - Options are different. Also, the Gear leaver is in the middle for the LS while it is on the steering wheels on the Base.
Engines: Engine size/type - Base came with the V6 3.4 liter, while LS came with the 3.8 liter V6. Power and torque - Base produces 180hp and 205ft.lbs, while LS makes 200hp and 220ft.lbs. Gas consumption - Base will do an average of 22MPG (19 city, 29 hwy) and the LS will do an average of 20 (17 city, 27hwy). LS is a lot heavier than the Base, which does not help its gas consumption. Speed - Base will do 0-60 in 7.9 seconds est., while the LS can do its in 7.6 seconds. That is, if they are equipped with the transmissions with the higher gear ratios. Reliability - Both are very reliable, and both suffer from the intake manifold gasket failure and need it replaced. The 3.8 liter however, has proven to be more reliable. It has a lot more room for tuning as well.
Options: Heated seats - LS standard.
Leather seats - LS standard, optional on the Base Steering wheel sound controls - LS standard. Tachometer - LS standard, optional on base.
Conclusion: If you are looking for a more luxury car, have the extra money and you don't mind if it consumes more gas, go with the LS. Impala LS is actually pretty efficient for the 200hp it offers.
If you are looking for a more basic car, save up your extra money and get the base. The base offers the same quite and comfortable ride, it is almost as fast, almost and powerful, and just as beautiful as the LS. It is exceptionally efficient with 29mpg highway while offering 180hp.
I own a 2003 Impala Base, and I do recommend it. I also recommend that if you don't mind the gas mileage and the higher price, go with the LS model, or better yet, the SS model.
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No they won't
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The 1959 Chevrolet - (Bel Air/Impala/Caprice).
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http://www.finishlinewheels.com/CHEVY/IMPALA/
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