All depends on your combo. What turbo, cam, you running? all stock? What ever you are running IMHO I would stay away from that sort of converter (generic) and get a converter through a reputable buick dealer made for "your combo". Try Pat's performance converters, PTC, Precision. I have had great success with Pat's performance converters (PPC). Research them before you buy. Not only can they be costly, but having to change converters b/c the one you bought is too large or too small is a pain. Good luck!