Lets start a thread for people to list the best mod and the worst mod they have made to their Vehicle. One of my vehicles happens to be a 2010 Jeep Wrangler, but the same best mod / worst mod request goes for any vehicle. Please try to either include a picture of the best mod, or a link to a web page.
I'll start.
Best Mod: Hot Head Headliners. http://hotheadheadliners.com/
These headliners top the list of mods to my Jeep because they have done the most to improve the overall driving experience. They decrease interior temperature and greatly improve the effectiveness of the airconditioning system in summer, and will likely have a similar beneficial effect on the heating system in the winter. They decrease wind noise and resonance of the hard top, and make the Jeep much quieter inside. They decrease glare and brightness inside the Jeep. And they even improve the way the stereo system sounds. I'm very impressed, and think they are well worth the money. Installation is rated "simple", and took me and my wife less than half an hour.
Worst mod: Goodyear Wrangler MT/R with kevlar tires (35/12.50R-17)
I've owned a whole lot of tires in the 35 years I've been four wheeling, and have owned more sets of Goodyear tires than I can count. I've had good luck with their product before, but not with the Goodyear MT/R with kevlar tires I bought in June this year. It appears that Goodyear has let quality control drop to all time lows. This set of tires is the poorest quality set of tires that I have owned in the last 17 years. I swear they are not round, or are not built correctly. They flat spot differently each and every time I park the vehicle. Sometimes there is actually no flat spotting, but other times there is severe flat spotting to the point that you can watch the hood of the Jeep visibly bob up and down as you drive along, and at other times the flat spotting will be anywhere between the two extremes. The thing is, when the flat spotting is there it never goes away at slow speeds. You can drive for thirty miles around town, and the tires are lumpy and bumpy the whole while. Once speed is above 40 mph the flat spotting smooths out, but at speeds over 60 mph an out of balance hopping starts, and continues to worsen as speed increases. I've had the tires rotated on the rims (OEM rims), and I've had the tires rebalanced three times (4 times total), and it makes no difference.
MOPWR2U
I'll start.
Best Mod: Hot Head Headliners. http://hotheadheadliners.com/
These headliners top the list of mods to my Jeep because they have done the most to improve the overall driving experience. They decrease interior temperature and greatly improve the effectiveness of the airconditioning system in summer, and will likely have a similar beneficial effect on the heating system in the winter. They decrease wind noise and resonance of the hard top, and make the Jeep much quieter inside. They decrease glare and brightness inside the Jeep. And they even improve the way the stereo system sounds. I'm very impressed, and think they are well worth the money. Installation is rated "simple", and took me and my wife less than half an hour.
Worst mod: Goodyear Wrangler MT/R with kevlar tires (35/12.50R-17)
I've owned a whole lot of tires in the 35 years I've been four wheeling, and have owned more sets of Goodyear tires than I can count. I've had good luck with their product before, but not with the Goodyear MT/R with kevlar tires I bought in June this year. It appears that Goodyear has let quality control drop to all time lows. This set of tires is the poorest quality set of tires that I have owned in the last 17 years. I swear they are not round, or are not built correctly. They flat spot differently each and every time I park the vehicle. Sometimes there is actually no flat spotting, but other times there is severe flat spotting to the point that you can watch the hood of the Jeep visibly bob up and down as you drive along, and at other times the flat spotting will be anywhere between the two extremes. The thing is, when the flat spotting is there it never goes away at slow speeds. You can drive for thirty miles around town, and the tires are lumpy and bumpy the whole while. Once speed is above 40 mph the flat spotting smooths out, but at speeds over 60 mph an out of balance hopping starts, and continues to worsen as speed increases. I've had the tires rotated on the rims (OEM rims), and I've had the tires rebalanced three times (4 times total), and it makes no difference.
MOPWR2U
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, but i`d have to say the 50 series flowmaster thunder catback system i first had in the 98, gave me terrible headaches from drone. 

