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Old 09-28-2020, 07:35 AM   #1
delta-mike67
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Join Date: Sep 2020
Location: Seattle
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Improved performance and gas mileage for an '07 4.2 9-7x

Bought an '07 4.2 9-7x a while ago as a move up from a standard '06 Trailblazer.

Am familiar with the performance and mileage of that vehicle, and I'm wondering what can be done to improve either...or better yet, both.

Thanks for any help, I (and my wallet) appreciate it!
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