Lowersing spring advice needed asap!

[tozmi]

ok guys i've done a search on the site and i'm a little apprehensive to call south yorkshire springs. some of you guys have said you waited over a month and still no reply.
i''m looking for a 40-50mm drop and from what i can see on the forum they need to be 30% uprated.
my car is on 215/40/17 tyres.
i want to tighten up the handling a little. the car will not get tracked, im going for 'looks' more than anything else.
i will post picks on the thread show us your silvia so you can sort of judge how it is sat.
thanks