I havent weighed them side by side and honestly the weight is not a concern of mine or the converter builder. The biggest problem with the larger 258mm converter that is standard in the supercharged cars is that cores are very hard to get and are expensive, where the 245mm converters are readily available and also what almost every converter builder uses for a base for performance rwd stall converters after a few changes are made. I prefer the 258mm converters for a few reasons and the main one being the lockup clutch is a larger diameter. For those who havent talked with me about converters I will note this.... I always have and will continue to use and suggest using the stock style 258mm converter on M90 cars that are running into the high 11s. I include them in my rebuilds standard at no extra cost. I use them because they work and there is little to no reason to have any higher stall speed than what the stock one can provide. The reason behind offering a performance aftermarket converter is for cars making big power and also for the NA and Turbo crowd, as they do require stall speed changes and the turbo cars need a converter that is built stronger internally to handle the extra power and to allow the turbo to spool faster.
-Scotty, you will be just fine using and OE style converter for your car
