Would there be any adverse effects? I am doing some planning for the turbo project, and I am not sure of the specs on the stock coil. Perhaps a 45,000 volt upgrade would allow for a better spark than the stock? Would the stock ignition system even be able to properly power an aftermarket coil?

Try this
www.jacobselectronics.com
Some interesting stuff there.

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2007 C 230 Sport.

I have have had the Jacobs system on my 300E for about 3 years now. Without a question there is an improvement in power. Not much, but it was definately an improvment. I can sell you my system if you like. I am going with replacing my whole ignition system so I won't need it anymore.

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Current Stable:
01 ML55 AMG
92 500E (a few mods)
87 300E (lots of mods)
00 Chevy 3500HD Diesel Box Truck
68 18' Donzi Marine
06 GT i-Drive7 1.0 Mountain Bike (with GPS!)

PREVIOUSLY OWNED:83 300SD, 87 420SEL, 88 420SEL, 90 420SEL, 86 560SEL, 86 190E 2.3-16V AMG, 94 E320

Are you going with Eletromotive Tech III ?

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2007 C 230 Sport.

I'm not exactly sure which system I plan to use right now. I am going to have to do a little more reasearch.
Here's a jacobs coil on ebay. it may go for way under what I would want.
http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&category=33691&item=2441006885

I would accept $200 for my system

So here is a quick question for you guys. http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&category=33689&item=2441183210 On something like that, would I connect the coil directly to the battery to draw power and then to my distributor in order to push the spark through? My concern is blowing out the guts of the old ignition system by putting too much of a load on it with the new coil. Secondly, does anyone know the specs on the stock coil? Thanks!

YES!!!! Done it to many other cars. It is usually the first modification that I do to any car that I own. Plus you will get better gas mileage.

The Accel coil you are looking at is not designed for your ignition system. I would not recommend this type of coil for your application. Accel does make a coil that works with your system though and i have used them before. Here is a link to the coil you would want to use. They are really no better than stock but definately cheaper.
http://re-racing.com/Merchant2/merchant.mv?Screen=PROD&Store_Code=RE&Product_Code=ACI-140008