How does lowering a car affect it?

the centre of gravity is lower which may well increase the possible cornering speeds

the car will be harder sprung and may well be more uncomfortable on bumps.

it will tend to ground more easily over speed bumps and similar so you need to take them slower

tyre wear is likely to be increased.

In my personal expierience loweing by 30mm does not make a great deal of difference. Obviously sports springs are alot firmer than stock springs so ride quality will be affected, the car will usually handle a wee bit better. The only thing you will need to keep an eye on is your stock springs (Presuming you are using stock ones) as these will be constantly compressed 30mm more than usual which can lead to leaks. If you havnt got the springs yet you should really go for coilovers. Atleast then the components will be designed to work together and you can adjust to your liking.

It'll have a nice firm but fair ride, and it'll have a better stance. Insurance companies only care that the springs have been fitted properly. I declared a full body kit, springs, engine mods, interior mods, the lot, and the independent inspector just checked that it was all bolted on properly, and My insurance didn't increase.

Don't buy the Nissan springs buy pattern ones they are the same but a fraction of the price.

You will be stung by the insurers if you lower it.

nota lot of differnce really makes handling a lil bit better :>)

but down side = speed bumps go slow

Better handling....harsher ride

will afect how it handles but it will be more stream line at it wil go faster