Both Siverstar Ultra (top of line) headlights and K&N Air Filter are priced at $60. My question is which would you take first? Im leanin towards the air filter because it helps gas comsumption and filtration to the Tahoe. The headlights are very nice considering the stock ones suck so please chime in......

 

air filter

 

I've dyno tested the K & N opposed to a Wix standard filter and saw 0 horsepower gain. Go for the lights.

 

I vote lights. popular opinion is that if there is any gain it is not where you need it. if you want a lifetime filter go ahead but power isn't a good reason to get the K&N

 

+1 ^^^^^

wait to do the filter until you can afford to throw S/C and full 3" exhaust! LOL!

 

I would certainly disagree with this.
The Wix 42487 is rated at 320CFM and the K&N is over 500CFM.
The Dyno's I've seen done show a slight improvement (>5hp) in power with the K&N 33-2129 vs. the stock AC Delco A1518C which is also rated at 320CFM.
While not a significant power gain (nothing you are going to feel in the seat of your pants) it is genuine and generally across the RPM scale.

I do not have a K&N filter in my truck, but I do use them in my motorcycles and boat.

 

Dont you still chance the issue of oil on the mass air sensor?

 

There have also been a lot of experts in the auto and truck industry that claim K&N filters allow fine particulates to pass through the filter media. This has been backed up and proven through engine oil analysis. I personally don't think its worth causing premature wear to your engine for zero to marginal horsepower gains.

 

I would go with the lights. But I would pay extra and get HIDs.

 

I'm not a big fan of aftermarket go-fast goodies in general and would not recommend a K&N filter as an OEM replacement for the GMT900's.

I’ve heard many rumors about lots of different types of filters and quite frankly; I think that much of what is said is without a shred of data to back up.
I had an 89 Chevy K1500 that I owned till it had well over 130K miles, it had a K&N on since nearly day one. I sold the truck to a friend who later sold it to his father. Several years ago I was offered a chance to drive the truck (for old times sake), it had over 260K miles on it and the old boy told me that the engine and transmission were original and that he was still cleaning and reusing the old K&N air filter that I put in it, so they must not be all that bad.

But when compared to a flame arrestor (that most boats come equipped with) or an oiled-foam element filter found on many motorcycles the K&N is a much better choice for sure.