To be honest with you the Corsa cat back system is fairly easy process especially if you have a lift,but a fair price would be 100.00,now regarding the DP it gets fairly more complicated as this being my second set and very familiar with the whole process,first of all try to find a reputable exhaust/muffler place and try to negotiate a price on both the items installed/package deal,to me personaly a feasible amount would be no greater than 300.00 on both items installed,also depending on the mileage and year of your vehicle and with the exhaust heat level being around 500 deg would definetly recommend installing new gaskets (x4 needed)for a leak free system,hope this helps any and welcome aboard. Z