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I would personally get headers first, then an e85 tune. Aftermarket headers + e85 tune will get you more ponies.
Are you planning on running a flex fuel kit?
Will this be a good upgrade?
Yes, e85 will reduce chances of rod knock and blowby. Your engine will be cleaner!
Cons of e85
- Bad gas mileage
- If you live in cold weather conditions, it will sometimes take more than one try to start it up
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