excuse me for being (newb) im new to the buggy world,im curious to know if buggy motors are pretty much the same as far as adding on aftermarket accessories as exaust and other engine mods and one more thing are the howhitt motors a worth product.

There's only a few different models of buggy engines, but aftermarket parts are pretty much only compatible with the model of engine they are made for. Most 150's are GY6 clones, while most 250's are CF Moto or CN250 motors. Newer Carter buggies of all sizes have SYM engines, generally considered better quality, but unfortunately, a niche market for mods as of yet. There are others as well, but those are the most common you'll find.