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Yes they do. Highly tuned NA cars have trouble even running at low RPMs (which is why they generally idle so much higher than stock versions). Highly tuned turbo cars have problems with torque delivery/response. Cars with high performance exhausts lose tons of low-end grunt. Etc.
If you poured tons of money into a car tuning it the way GT5 is saying that it is being tuned by the parts description, the end result would be almost nothing like what GT5 delivers. This is clearly seen by the regular cars that you tune to a certain performance level and the tuner cars in the game that can be bought at that performance level having drastically different (and in the latter example, usually inferior) performance characteristics.
The performance realism is the problem.
Take the premium Civic Type R and take it to 225 HP (I'm pretty sure this can be done with exhaust, ECU and cat alone). Then compare to torque curve to that of the Spoon Civic Type R. The Spoon is practically the pinnacle of what can be done with that engine reliably and without turbocharging in real life, but the one you put together has the same horsepower and a few dozen more lb. ft., both at several thousand less RPM.
In real life, the Civic you tuned if you equipped those parts would have something like 15 more horsepower than it did stock if you were really lucky, and it would probably have identical if not slightly worse torque (and the low-end would be notably worse). In the game, it has 40 more horsepower, and almost as much more torque, both at an RPM that is practically the same as the stock power peaks with an identical torque curve.
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