i have just fitted some second hand gtpumps items and they seem quite good and well made. not overly easy to setup a new belt on. through work we have gotten in HKS and fidanza adjustables and both are of top quality. we have not had the new gates racing ones in but know gates they will be top quality also, and they do make them for the 4g63 engine although i cant checked if its earlier or later models or if that makes a difference?