it depends on the specific vehicle and how much adjustment they have, if its tuned lean the cai will make it worse. and if your wanting mileage the time to recoup the cost wouldnt likely be before you are ready to sell the truck. ive never had any issues with the K&N drop in type and pay for them selves in a reasonable amount of time. i put them on all my cars and atvs.

i know a guy that put a cai on his toyota and the check engine light came on it was lean and he got worse mileage and power with that

I'll have to see what the truck does after I install it. I'm not hoping for a miracle, just know it'* an easy mod that can help squeeze a bit more out of the truck. I'm going to keep my fingers crossed it takes to it and doesn't need tuned to see a benefit.

Wonder what the deal with the Toyota was? Maybe the factory box was actually doing a better job either restriction wise or air temp wise than the filter he put on? I wouldn't think that there is such a thing as air being too easy to draw in.

Next on my list is to swap out the trans fluid and change the filter. I'm thinking I'll find some type of suction device that I can drop down through the dipstick tube and suck most of it out, then drop the pan, change the filter, and refill.

Got the new lights in:

do you know what lights up the rings? leds?

Yep, it'* just a clear plastic ring with just a single LED at the bottom I believe.

looks cool

Those lights look sweet! There'* a Chevy driving around here with similar ones...

How well do those function? I'm debating on a set for my Silvy when I get the money. If they work well I'll go for it.

They work great. The only downside I see is you pretty much have to take them out to adjust them left-right and up-down. I can adjust the left one since I have the factory air box out in favour of the K&N so that gave me access there. I replaced the battery at the same time I did the lights so I just set the battery off to the side a bit giving me access to the adjustment on the right one and did the adjustments before putting it back.

Also, they come with high bulbs. I would stick with those and just put HIDs in the lows. Then you can still flash to pass, and I think the regular bulbs work better for highs in that housing than the HIDs anyway.