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question. what is a diverter valve? what is it for and why does it sound like a blow off valve?

the reason i ask is because my friend just put one in his 1.8T passat but i dunno if it's just for the sound or if there is a hp gain or something too. he took it to a shop and they "chipped" it, put in an intake and the valve, and charged him $1k lol

 
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DV=BOV

They call em diverters because they're usually recirculated into the intake rather than vented to the atmosphere..

 
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^yes

and your buddy got raped.

 
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Yes, yes he did get raped

 
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lol that's what i told him but he's pretty stubborn. they didn't even put it on the dyno or anything and i have no idea what chip he's talking about.

oh and is one better than the other? does it do anything to a pretty much stock car? is it DIYable?

 
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it all depends on what he is looking for and how much power.
just to add yes he did without a shadow of dout he got raped

 
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the quality of the "chip" depends on the tune programmed into it. Most of the more well known ones (APS, etc...) do pretty good jobs. I guess the chip job is relatively expensive, but most people I know just sent their ECUs in and it comes back a few days later done. As far as doing anything to a stock car, it changes the fuel and boost parameters, it also does a great job of heat soaking the stock IC if you beat it a lot.
I don't know what the chip job costs, I think its about 3-500, a DV depending on who makes it is 1-200 for a decient one and an intake is maybe 200. I don't know if a G is too bad, but it sure sounds like a lot.

 
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a g for that little of stuff to instal is bent over the counter rape

 
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that should have cost no more than 300 buck in labor...including tax if your state allows tax on labor