I'm getting details set for taking my '03 ST on a 4K mile trip in May. The chain/sprockets have 21K on 'em. I'm considering replacing both before leaving. Any ballpark estimate on cost of parts/labor for this job? I'm thinking of doing the work myself, but might turn it over to a tech. I don't think I have to tools/talent to do an endless chain, I'd probably have to install a master link. Thanks!