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2007 Colorado i5 3.7l engine, performance uprgrades advice

2.1K views 4 replies 4 participants last post by  CadenH  
#1 ·
I have a 2007 Chevy Colorado with the 3.7l inline 5, and I want to do some cheap performance boosting upgrades if I can, any advice on how to increase hp, mpg or otherwise? They also need to be california legal unfortunately.