Performance parts that also increase mpg?

K&N air filters/filter systems usually increase mileage, as do dual exhausts and headers, most things that make your car run better wont though, and now w/computers its not like back in the good old days, as bud put a K&N, pulleys, hypertech repogrammer and borla exhaust on a '93 LT1 corvette, ran 13.92 1/4 mile before and 14.17 after, go figure???? really cant explain that one myself.........?? possibly the air flow from the K&N and the borlas leaned it out too much and he's getting high speed lean out, or.....?
 
Thanks for the additional responses. I hit up one of my car performance gurus with a "what would you do?", without wanting to spend a whole bunch of money.
He said that since my truck has dual cats, and a single muffler, he would go with a TRD or Flowmaster setup, whoever makes one that I can bolt right on, with dual exhaust pipe and two mufflers. Said he would expect 2, maybe even 3 mpg increase, and a better sounding exhaust note, but not to expect much performance-wise, based on the way I drive. Fine with me, since gas mileage is performance, with the truck already having enough power (and a noticeably better throttle response with the new intake).
I trust him, but welcome any comments.

Here are the pics for powells85:
 
OwenM said:
Thanks for the additional responses. I hit up one of my car performance gurus with a "what would you do?", without wanting to spend a whole bunch of money.
He said that since my truck has dual cats, and a single muffler, he would go with a TRD or Flowmaster setup, whoever makes one that I can bolt right on, with dual exhaust pipe and two mufflers. Said he would expect 2, maybe even 3 mpg increase, and a better sounding exhaust note, but not to expect much performance-wise, based on the way I drive. Fine with me, since gas mileage is performance, with the truck already having enough power (and a noticeably better throttle response with the new intake).
I trust him, but welcome any comments.

Here are the pics for powells85:
Click to expand...
Looks like the crankcase ventilation hose. I don't know why K&N would make a mistake like that though :confused:
 
I vote for leaving it alone.

It will take forever for just a few MPG improvement to pay off your changes. Plus anything that improves the sound or performance will mean you'll be putting your foot in it more, which will cause you to get worse mileage then if you had left it alone. Which means you'll be paying for extra gas AND the changes.

If you want to drive a truck and get better mileage, buy a diesel.
 
Seriously think about getting a V6 Diesel in or around 3L (Toyota has a model here in Japan that is called the Surf, which I think is the 4runner in the UK and US)

I guess on a straight run you would get at least double the MPG you are getting now. If thats not an option perhaps look into a LPG conversion.
 
my bud put a bunch of banks stuff in his '03 dodge 3/4 ton cummins (ie reprogrammer,something to the turbo to increase boost,4" exhaust pipe and muffler,different intercooler) and that thing scats for a 3/4 ton truck, i dont know about big burnouts like in the ads, but it runs a lot better, my bud said the mileage is up about 2-3 mph too, he added it all 'cuz he pulls a big trailer for his business and wanted a little more 'ooomph'
 
Update: The intake didn't do much for my gas mileage. I can definitely tell the difference in power while accelerating, but the increase in average mpg over a couple of tanks was on the wrong side of the decimal point. More like .3 instead of 3-4. Figures. :grumpy:
Going to 93 octane gas has caused a 2+ mpg bump, though, and will save a couple of bucks a week. Woohoo :rolleyes:
 
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