New Fit question.

[HyperFIt]

I am picking up my 2008 Honda Fit Sport Monday.

Totally new to honda, but I have a year left on the warranty.

I would really love to put an intake and an exhaust on this car just to improve gas mileage, does anyone have any suggestions?

Also, will this void the warranty?

[manxman]

I am picking up my 2008 Honda Fit Sport Monday.

Totally new to honda, but I have a year left on the warranty.

I would really love to put an intake and an exhaust on this car just to improve gas mileage, does anyone have any suggestions?

Also, will this void the warranty?
Intake and exhaust modification will not void the drive train warranty unless you make a mistake in installing the mods that causes an engine problem. If you do that, the warranty will not cover the damage. Your Fit has a a tube that sends crankcase emissions into the intake system, and right next to that tube is another one that recirculates radiator coolant through the intake manifold at the base of the throttle body. The hot water from the radiator pre-warms the incoming air to prevent ice formation in the throttle body. Here's the point- if you switch those tubes, and connect the coolant tube to the air inlet that was meant for the crankcase ventillation, you may wind up with a serious problem. The dealer service mechanics will laugh themselves sick if you come in with the warranty claim.

To decide what intake and exhaust you should buy, there are many reviews for both on our forums. All of the reviewers have their favorites, and all have good reasons for those favorites. You can also find hundreds of reviews for modification parts on other forum sites. You just have to do your research and make your choices.

No matter what intake and exhaust combo you choose, you will gain at maximum 8 hp in power increase, but you won't gain much, if any, extra mpg.

[HyperFIt]

I find that really surprising. In my last car a Toyota Celica I had GREAT results putting a cat back exhaust and and a cold air intake on my gas consumption. I will look into it.

I will have to take a good look at the stock intake before I decide on whether or not to replace it with a cold air intake unit.

[manxman]

I find that really surprising. In my last car a Toyota Celica I had GREAT results putting a cat back exhaust and and a cold air intake on my gas consumption. I will look into it.

I will have to take a good look at the stock intake before I decide on whether or not to replace it with a cold air intake unit.
You will find a LOT of differences between your Fit and your Celica. What works on one won't necessarily work on the other.

[HyperFIt]

I hope there is a huge difference. I could get 38 mpg out of my 1.8L celica.

[macbuddy]

I hope there is a huge difference. I could get 38 mpg out of my 1.8L celica.
HyperFit,
I am guessing that you won't be seeing as much of a difference with the Fit, as you did with your Celica. Honda engineers seem to already be squeezing near maximum performance, and economy out of their Fits as shipped.
Having said that, I do feel that you will notice some differences. Just don't expect the results to be as obvious as with your Toyota.

I find that really surprising. In my last car a Toyota Celica I had GREAT results putting a cat back exhaust and and a cold air intake on my gas consumption.

Over the past 5 years, I have experimented with various combinations of intakes, exhausts, and headers, spread out over a period of several years. All of this was done in hopes of creating a better performing Honda Fit.
I first added an intake, then an exhaust and lastly a set of headers on my 5AT GD3. Each mod gave only slight improvements, if any.
Always in search of better performance/economy, I first tried a K&N drop in filter, then a modified airbox, then a K&N SRI, and finally found the Injen SP1511 which I am very pleased with. I first installed it as an SRI, but I prefer using it set up as a CAI. I enjoy the intake "roar," and it seems to like the way I drive.
As for exhaust, I first tried a custom made "bolt on" Magnaflow axleback. Half a year later, in search of even less restriction, I thought I'd have a straight pipe axleback fabricated. After several months of switching back and forth between the two, I eventually decided on the Magnaflow set up. I preferred the torque per decibel ratio much better than the fun, but "raspy" straight pipe (check out my "straight pipe" video below).
As for the DC Ceramic Headers, I enjoyed that mod from day one. It was the "key" mod that helped all the other mods work together. As it has been said for decades, it took all three mods to help make my engine finally breath freely.
Ultimately, these mods made my Fit more fun to drive, but I am not so sure that these helped improve fuel mileage all that much. I spent nearly $1.000 in my quest to bump the mileage up maybe 10%???
If economy is your primary goal, maybe you should be looking into a Scangauge instead. I admit that I have been "Schooled!" I learned that if I follow the ScangaugeII display, and drive accordingly, I can get as high as 40 mpg. If I drive the way I like to, the figures drop into the 32-35 mpg range.
Will these mods void your warranty? I think manxman answered that. Will these mods make a huge mileage improvement? I have to agree with manxman..."you won't gain much, if any!"
Cheers,
-macbuddy-
PS-Just for the record, would I ever go back to stock? I'd have to say, "absolutely not!"