okay i have a few questions i have a 2005 mazda 6 Sport i want to lower it evenly from the front and back what are some lowering springs that can do that I'm trying to put some 17" or 18" rims on it which size is recommended to get a nice full a rounded gapless space where the wheels go if that makes sense?? i can't really explain it and also any good mods to gain HP make run faster better I'm open for any tips as well thanks!