Personal preference on a few of these, some rate them more than others. Start with new track rods and ball joints Light alloys and grippy tyres are a must So are coilovers LSD Adjustable panhard Rear anti roll bar Front and rear strut braces Polybush absolutely everything, drop link bushes, rear beam etc. Anti lift kit to adjust castor A weld in cage will properly stiffen the chassis up but not everyone wants / needs one. There are a good other few braces in the ultra racing catalogue. You can also get thicker front anti roll bars but you may find a slight increase in understeer. Its also really important to have the alignment set up ofter handling mods.