I recently bought an 09 DX and was thinking about getting the fatshots as a replacement to the stock exhaust!!!

Im thinking of ordering the fatshots for now WITHOUT the fuel management systems or a filter! So would it be normal/ok to run the bike with fatshots ONLY or would it harm the engine as i keep on hearing?

Also, im looking for a smoother and not too loud exhaust note, but obviuosly louder than the stock ones, would the fatshots be an answer to that?