OK so I've been doing some searching and here are the options I have uncovered to date. I was wondering is there was any more light people could shed on this matter with pro and cons of each. I know there are helical, viscous, clutch type etc LSDs but what are the pros and cons of each? well anyway... here's the options for our cars... LSD options CUSCO Cusco RS 1-way LSD 186 C Celica 99.1- ZZT23 2ZZ-GE 1,073.33 USD Cusco RS 1.5-way LSD 186 C15 Celica 99.1- ZZT23 2ZZ-GE 1,073.33 USD Cusco RS 1-way LSD 186 F Celica 99.1- ZZT23 2ZZ-GE 1,073.33 USD TRD COROLLA RUNX ALLEX WiLL VS ZZE123-128 01.1- 2ZZ-GE 41301-ST804 F 96,000 Yen KAAZ 99.09- ZZW23# 2ZZ-GE MT FRONT OPEN 1.5way DBT2100 925.00 USD Quaife (which one?) Toyota 2000 Corolla GT-S 6-speed QDF15E £495.00 Toyota Celica / MR2 Spyder 6-speed) QDF21E £520.00