I was poking around with the game last night looking for hidden things
and I thought I would have a play around with the in game car modding
(That is to say the mods you can apply in the garages not mods you can
inject into the game). A few things became obvious I thought I would
point them out...

Fitting NOS to your car and activating it does not increase the top
speed of your vehicle as it does in real life. In San Andreas it merely
increases your cars acceleration so it reaches its top speed faster,
you won't go any faster burning NOS than you will without activating it
(And without the annoying trail effects as well). The perception of
increased speed comes from the fact that you reach top speed faster due
to the increased acceleration and the trail effects. Also the cars
gearshift sounds do not change, giving you the impression the car is
still accelerating when it really isn't.

Of course, timing yourself travelling over a set distance with and
without NOS will show you achieve it in a quicker time using NOS than
without it. This is because you reach top speed faster and travel
longer at top speed, whereas without it you have a more gradual
acceleration taking longer to achieve top speed and therefore taking
longer to cover the distance.

NOS is also one of only 2 mods you can apply to your car that have any
kind of effect on its performance. The other is fitting offroad tyres.
All other mods are entirely cosmetic only and affect only the visual
appearance of your car. Spoilers and such do absolutely nothing. Many
people refuse to believe this but its true. Just look at a modded and
unmodded cars stats.

Bass boost does increase the bass on the cars stereo but you need a
fairly decent sound system or sensitive hearing to appreciate it which
is why a lot of people seem to think it does bugger all. The speakers
fitted to most standard TV sets are generally not good enough to hear
it well on the PS2 version. Get a 5.1 surround sound system or really
good speakers and it becomes a discernible difference.

The Infernus's top speed of 140mph can be increased by 5mph by fitting
hydraulics to it but this is the only car it works on so I'm fairly
certain it's not an intentional thing. All others top end speeds are
unaffected by hydraulics. The lowering of the car does not alter the
centre of gravity at all so claims it increases the cars handling can
only really be a perceived effect rather than an actual one.

The large vehicles such as the Roadtrain and so on could in theory be
modded with hydraulics, tyres and bass boost but they are flagged as
unmoddable cars by the game and hence you can't mod them.

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