I have 20" Black Gianelle Cairos on my black GP. The ones in my sig. Would i be a ble to lower my car any with these or no? i had 18's before i had my 1st set of 20's. Had it lowered with b&g springs. Took the car to a tire shop to have the new 20's i had waiting for me mounted and balanced and when the put them on, the body of the car sat on the tires. Is there a spring that i could put on that wont make it do that again? would i have to get AGX struts to be able to do this?