GM Truck Club Forum banner

CAI , Exhaust, or Programmer

3352 Views 9 Replies 6 Participants Last post by  06MonteSS
I have a 2003 Silverado 1500 with the 5.3L. It has 125,000 miles and I'm trying to decide what to upgrade first. I want to improve my mpg mostly. How much of an increase can CAI's really give you. I was looking at getting a K&N because most people seem to get those and they seem happy with them. I saw on a review where a guy improved his miles per tank from 320 to 400 after the CAI, is that possible seems a little too much for just a CAI. Also is a throttle body spacer worth it? What exactly does it change?

Also how much does exhaust improve your mpg if you drive normal. I know driving habits can change after exhaust is installed and more than likely I would fall in that category so I'm thinking this is going to have to wait. I've also read getting headers can help. Can someone explain how this can help, I'm not very knowledgeable with this stuff but trying to learn.

For the programmers I was looking at the Diablosport Predator. Everyone on here seems to like that, but how much does it really improve your performance and mpg.

For right now I want to just do one of these because I don't want to blow all my money on my truck. What do you guys suggest?

Thanks in advance!
1 - 2 of 10 Posts
Go with the main four (I,H,E,P) and add in a custom tune :rules:. Like 98Hotrod98 said, you're not really going to see all that great of a gain from any one individually. If you did all four and went with a custom tune for your DSP, you will see good improvement. The problem with "performance" mods and MPG is that most people have a hard time keeping their foot off the gas pedal. You will want to feel that extra HP and/or hear the sound of your new exhaust. The TBS is useless on your year truck but it won't really hurt anything either, I picked one up for like $40 on eBay. I wouldn't recommend spending over $100 for a brand name one. Headers work by helping with air-flow; the less restrictions you have the better the air-flow which means more HP. The better your engine can breathe, the more efficient it can run. Go with long-tubes though.
With the DiabloSport Predator you plug it in, set your tune and change whatever parameters you want to adjust, then unplug the tool. If you can plug a tool in to your OBD port and follow directions, you can work a DSP.
1 - 2 of 10 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.