$300 is much better than $550 for the BP one, but still pricey for what it is. If I decide to keep my A14 then I would concider the $300 if they are available.
If you only got 20mpg with a 620, then you don't know how to tune it mine gets 30 to 32 mpg and runs good enough that people have asked what V6 I have in it. Also my Lexus SC300 with the Supra twin turbo engine gets 25 mpg, and will smoke your Galaxie any time! :fu: