guys, been ringing around a few insurance companies mentioned on here by other members who took out policies with them and most of them say too many mods or a ridiculous figure

my car:
seat leon 1.8T
mods:
turbo back system, remap (soon)fmic, 18" alloys, lowered 35/40mm, silicone hoses, jetex filter, forge 007p
i am:
34, 15 yrs driving experience, 10 yrs ncd, garaged overnight, no points/medical issues or covictions

cheapest so far is £525 from sky insurance with £250 excess.
i am currently with HIC and my renewal is £510 with the fmic/remap /turbo back system
my question to you lot is do you guys declare ALL your mods?
i realy dont facny tryigng to cheat for a cheaper quote and then getting caught out and having my isurance invalid. :embarassed: