^^^^
What Gumbanger conveniently leaves out in his indepth bag of wind is the old adage: "you get what you pay for".
A couple of things to remember if your looking at the price of the KenneBell kit:
1) it comes with injectors
2) it comes with a new aluminum intake manifold
Not sure what kind of bucks 8 x 36-42# injectors cost...but add that to the bill on the centri....I'm sure it'll add up to quite a few more bucks.
The new aluminum intake is a very valuable part of the KB kit...so you get to ditch that plastic POS stocker that has a track record of inevitably breaking.
Try blowing a stock intake manifold with a centri set-up on a mild street car, and find an aftermarket replacement that will fill the need. Reichhart(sp)...no way...P51...ain't happening...both are pretty much race applications. So if/when that happens...you're stuck buying another plastic POS.
I priced out a polished Vortec 8psi non-cooled set-up at the same time I priced out my polished 6 psi KB...and at the end of the day, the difference out-of-pocket was minimal. (this included the price of install BTW)
While the KB may seem pricey at first...you get more value for your dollar....and pretty much everything is included in the kit besides spark plugs.
You get what you pay for!