the only turbonetics parts are the piping which I haven't replaced yet to boost logic's pipes. I hate turbonetics and so do a lot of other people. their products are not that great. boostlogic's parts are far superior to them. the only difference in the supra (twin turbo) motor is the head which is labeled as the 2jz-gte the non-turbo supras and the sc300's come with the 2jz-ge motor. Same bottom end just a different head. you can get a new 2jz-gte motor for about $2500 and have to pay to install and convert a few other things. or just get the kit and go from there it depends on what power you wanna make. the ge motor is reliable in stock form to about 750 at the wheels pretty much the same withe the gte motor, but when you want the more power, you need cams and such which are parts that are usually made for the gte motor only. and last, no, there isn't any trouble with the piping except for the way turbonetics has it setup, boostlogic's is a little different and better.