Scrape out some sound deadening to start with. If you're patient, you can do it without dry ice. Your car might be too new though for that to work. At about 10 years, the sound tar will just crack away on its own. Swap to new wheels that are lighter (you can get new tires too and add some grip). Carbon fiber is good too, but make sure it's real carbon and not carbon layed over fiberglass. The good stuff is more expensive, but weighs a lot less than steel, aluminum or carbon on glass. Find a smaller, lighter battery. New seats tend to weigh less. Some people would throw out the rear seats, but I think that takes away from the usefulness of the car (I would also put the interior panels back in, but that's just me. They don't weigh much and they make the car look complete). If you've got money and time, changing metal fasteners to plastic and stripping undercoating will net a few more pounds. Losing a/c, and (if you have it) tossing the sunroof will also save weight. Sunroofs are hard to remove and doing a good job of covering up the hole is a lot of work. And since you live in Florida, I'd keep the a/c (take it from me, no a/c is not fun when you live in a humid state). Don't buy lexan windows for a daily driver, they scratch too easily and expand and contract a lot more than you'd think.
The intake manifold and TB aren't what have to be changed for a turbo. Your new header will have to go though.
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