With the LSD, you will need to change the speedo drive gear as well as the ring gear inside the gearbox as they are different between the MR2 and the Camry. This also means your speedo will be out by about 13% or so (it will read slower than what you are actually doing so you can get speeding tickets a lot easier). Another thing you will need to change is the axle stub/s as the Camry ones are different. If you are lucky the right side will slot in properly with the LSD, but you definitely will need to get the left one. Or if you go custom heavy duty shafts, you will be spending big. My first set costed $700 for the pair which the CVs broke after 1.5 year. Also after installing an LSD you will be chewing through more driveshafts/CV joints and what not because instead of letting the tyres take the brunt of the power and slipping, all the power/torque now is constantly being transferred to both shafts and joints. The SAFC gives you adjustments for 5 points in the rev range. Where as the E-manage blue will give you, if i remember correctly 64 points, 8 points at certain % of throttle if you tune with the laptop software. Or you could go for a stand alone system. With the pulley sizes, you won't be able to just change pulleys whenever you want because your tune is set for a specific amount of boost. So each time you change the pulley you will need to get a new tune. 7psi is risky. Both Andrew and I have killed the knock sensors just running 4psi as they are very sensitive. And one of mine died again when they were tuning it with the 5.5 psi pulley. So running more boost can and will kill them, just a matter of time.