Quick question 4.8L VS 5.3L
#7
update
Got the K&N on my wifes (Soon to be mine) '02 Avalanche with the 5.3L. Was able to bolt her stock air breather & intake tube back onto my '03 Silverado. Next in line is dual exhaust , catback system on the avalanche (1 in 2 out) with possibly Flowmaster 44's. My Silverado had 50 series on it, and sounded good but i'm thinking 44's on the 5.3L Avalanche, what do you guys think? I wanna be able to still get it inspected, will the 44's be too loud for inspection? I'm thinking probably not. This won't be getting done probably for another year or so. The reason i'm switching the the Av is i'm letting my Silverado go back (Trying to downsize our financial situation). Payment on the Silverado is $440 a month, its a long story but i think this is the right decision, and i wanted a 4 door truck and the 5.3L, so with the Av, i'll have both.
#8
I have an '09 Silverado 5.3L with the K&N CAI. I have the Flowmaster 40 SIDO muffler. There is a little resonance, but I like it. The sound is very "throaty" when idling and howls a bit when I get on it. I'm sure it'll pass any inspection. But, just in case, ask the exhaust installer to put that it will pass in writing or they'll make it right, then you're good. Here's a youtube link to my truck's new exhaust:
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