Although I can't speak from personal experience ? I can tell you that Doug from bamachips.com does not recommend throttle body spacers and considers them as a complete waste of both time and money...For the very same $90-100 bucks ? you would be much better off spending it on mods such as FRPP delete plates that are both proven and guaranteed to provide between 8-10 additional HP...Therefore IMHO ? the FRPP delete plates would be your best bang for the buck mod under $100.00