Ordered the Coleman Mach 8 w/condensate pump to replace my Coleman Delta TX. I also bought an extra roof gasket to get a proper roof seal w/o the OEM drip pan as recommended by Airforum subscribers. Now I've heard about a "hush kit" that quiets down the Mach 8. Is this an upgrade to older Mach 8's or something all Mach 8 users should get to quiet down their units. Just want to drag this thing up to the roof just once (for a while)... Thank you in advance for your continued support and information!!!