RobEvans

Hello, i want to put a K&N 57i Gen II Intake Kit on my s2000 but i drive 450 miles every week to work and mpg may be a concern, do you guys think there will be a noticeable difference? Same question for the exhaust!

Thanks guys!

drewz

Generally, performance exhausts and intakes increase mpg...not decrease mpg. In my old car (lancer), I got an extra 2 mpg from using aftermarket intake alone

charliec225

I drive about 350 miles a week to work. I was logging my mpg prior to getting an FIPK and was averaging around 28ish mpg over about 2 months. After getting the FIPK, there was essentially no difference for better or worse. The biggest impact you'll see probably is that the sound is so much better it's hard to not dip into the throttle more just to hear it.

slipstream444

Typically, you will see a very slight increase in MPG (maybe 1-3 MPG steady state). The stock intake and exhaust are more optimized than in other factory cars. There are HP gains to be had, just not as much as you would see with other cars.

Any drop in MPG is typically associated with the heavier foot that accompanies any modification. Additionally, even a slight increase in air volume throughput capability gives your car the ability to consume more fuel for a given throttle position - even at part throttle. This can give the impression that your car is getting less MPG overall, when in actuality the specific and volumetric efficiency has actually increased ever so slightly. IOW - steady-state MPG should improve slightly, but aggresive driving will result in worse MPG. The increase in MPG is nothing to celebrate, and certainly not enough to pay for itself over any short period of time. You'll see more MPG variability with the change of the seasons, and ultimately MPG's greatest variable is the driver.

I can see up to 29-30 MPG average on a long road trip if I keep the speed at or below 71 MPH and use the cruise control on the flat sections. That's with 4.44 final drive and an AP2 transmission (read the rest below). I've achieved higher by using basic hyper-mileage techniques - but this car is not meant for that. I typically see an overall average of just at 25 MPG with 70% hard-driven city miles.

starchland

I remember on a road trip with my buddy (we both have the same car) at the time we both had intakes, the only difference was I had a Fuji, and everytime wed fill up my car always took less gas, fwiw.

S~Factor

If your driving habits stay the same, you should see the same MPG. But there lies the problem, you wanna hear that intake, you wanna hear that exhaust. To do that, you rev the engine every other block... and there goes your MPG.

Billman250

I have header, test pipe, intake, exhaust. MPG is better at cruise.

Boofster

They will not AFFECT your MPG in any significant way.

kchandra

Bill - did you do anything to tune your car - AFC or the likes of it? I have the same level of mods as you and wondering if you did anything like that to reduce how rich these cars supposedly run in lower RPMs? Thanks!

starchland

From what I've seen looking at many dynos, ap1s rich up top. adding i/h/e should help lean it out sOme but every case is unique. From my experience i/h/e improved highway mpg nicely. Less pumping losses ?