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these engines get pretty darn good mileage even completely stock. (for an older v6 design) i got 31-33 driving 80mph on an 8 hour trip with my grandmothers 96 olds cutlass with the 3.1- ive had customers report similar mileage.
yea they sell some crazy aftermarket stuff for the 3.8. all different cams and heads. turbo conversion. i think i saw a late 90s pontiac grand prix gtp in the 9's
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