I know this has been hashed about before but I gotta ask. I'm thinking about a set of RV275's for my mostly stock '02 with 118,000 miles, see other stuff in my signature. I do haul a pretty heavy camper and tow a boat. The truck has a Quad ZXT+ chip thingy (pretty mild by most standards). My question is...amd I just wasting my $'s or will I see a REAL difference?Second question: Can I install them myself? I not a total idiot with a wrench and can follow directions. I was thinking it's also about time to adjust the valves too. Thanks to all for opinions.