I'd have to go with Dave Cloud's "Dolphin". It pushes the envelope in so many ways and a cost of only around $3000. It's just mind-blowing.
3-Wheeler's insight tail extension is a close second. He just has an insane level of attention to detail and polish on the project... not to mention documentation.
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Slowly modding my 2000 sonata to what it should be... one project at a time.
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