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Originally Posted by blindxeyed
On the contrary, almost every aftermarket part for the 3.4L will work for the 3.1's and 2.8's. And that's an aftermarket that's slowly growing bigger. Your cars gas mileage actually goes up with performance mods. When I first got my car and it was stock, I averaged around 16 mpg. Now after what mods I've done, I'm gettin around 20. And that's on regular. I get around 24 mpg on supreme.
I mean if you think about it, when you put an intake and exhaust on your car, you're freeing up the air flow making the engine not work as hard... so, that's not going to be a negative factor, but rather a positive thing. The less your engine has to work, the more hp and gas mileage you get.
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That is precisely what I meant by it not having much of an aftermarket, currently. I have looked into the aftermarket for the 3.4 and it isn't too bright, not even close to the 3.8. And while I do agree that some mods will increase your gas mileage most of the high end ones that really gain you power will reduce your gas mileage by a lot. It is pretty common sense to realize that the more power the engine makes means it will need more gas and more air to make that power. Almost anyone you talk to will definately say that adding HP reduces fuel economy.