As a quick gauge on market, I always check ebay completed auctions.
They show around sixty auctions for 04-06, majority haven't sold.
There is an 05 with over $30K in performance mods that sold for $17,000 thereabouts recently.
I follow these and many with performance mods are listed in low to mid 20's, but are a hard sell.
The one you listed seems to have quite a bit more mods than many like the trans and convertor upgrades, ect.
Most have a dyno tune/ baseline and post mods run and paperwork/printout... if he does not have, I would ask him/pay for it and take it to a tuner for one.. if buying for the performance claims.
Good luck with purchase.
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