i have been noticing an exhaust leak lately and inspected my exhaust to find the up pipe leaking at the turbo end, how will this effect my performance and fuel milage? also how big of a job is it to replace these? it looks like the turbo has to come off and if thats the case then i will wait to do my ww and turbo back exhaust. also the trucks got 240k and was used for plowing so the bolts look like they are gonna snap just looking at them. what are the tricks to not braking all the bolts off?