I like them, de spoilered they look great too!
As much as I like cosworths, I think for the money they command these days you can buy better cars!
I dont think it takes much to get decent power out the supra's, fuel cut defencer, exhaust, intercooler and raised boost should see a decent gain, forget what one recently made on the rollers we had in but it went pretty well for not having much done to it.