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signitures are limited to prevent having users have to deal with an entire screen of text just from one signiture. This limit will not be lifted. If you want to list all your modifications I suggest getting a webpage from a free site and hosting a picture of your vehicle and your list of modifications. You can then have a link to your site as your signiture.
Make an MS Paint jpeg file and type in your mods to that pic. Upload the pic here and copy the link to your sig, using the "image" tags. Thats the easiest way.