i made some baffles for the sporty and you can buy proper fiberglass same as they use in the coby/resinators and also perferated tube fot the middle in different sizes
i got the small pack ov f/glass and only used a bout half ov it pretty cheap also round 30-40$ with 1/2 meter ov perf tube i think
it made a suprisingly big difference also
if you cant find any i can supply it for ya but would have to double check the price