well for suspension there is extended a-arms and swing arms. ASR on ebay makes very good a-arms. Works, elka, and others makes nice a/m shocks for blasters. Extended axles are always a must.
For engine you can big bore to a 240 get a stroker crank and have it ported for big gains in power. Exhausts are a big choice too there are many good pipes. LRD, dyno port, F7/CT/ power pros, vitos fat basterd, shearer all would be good pipes for a big bore engine. You need a bigger carb, air intake set up
some dress up parts plastics, nerfbars, billet pieces all kinds of stuff lol