Looking to upgrade my front calipers to LS400 calipers. Can I use my IS300 brake hoses or do I have to get LS400 hoses for the upgrade.

 

ls400 calipers do not bolt right upon an IS300. You will need rca spacers and also need new bolt adapters. Figs engineering sells both as a set. they are the same as if you where gonna supra calipers, just a little extra work getting the alignment correct.
you will most likely need these package
http://shopfigs.com/v1/index.php?rou...&product_id=91