which one is easier to install, safc or safr? which one is better to use for an n/a supra? also, does anyone know what i will be doing when i am installing this? will i be cutting wires? which wires? etc? i'm thinking of ordering one of these at the same time as the exhaust, installing them both myself to save money, and then get the safc/safr dynotuned. what do you think? how much should i be looking at to get this dynotuned (am i spelling that right?)... and how long will it take to dynotune? thanks.