Will I feel a difference in acceleration and power if I add 7 numbers to 91? Its not street legal but that does not bother me.

Nope,
Increasing octane levels only helps prevent detonation. Since your stock engine has no power adders, high compression or advanced timing that would induce detonation it would be a waste of money.

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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

this sounds so weak but...it says on the bottle....that...Lowers accelaration times and adds horsepower. i meeeann if the bottle says so.

I'm sure it will have plenty of placebo horsepower. Just put a K&N sticker on your window. That kind of horsepower will last for more than one tank of fuel.

In asking the question it shows your smarter than the rest of the rice burner (wannabe) world. I commend you for that. There's no "performance in a bottle" that will give you more power. The key to high(er) performance in any vehicle is money and knowledge.

__________________
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

Well, he could buy a gallon or two of nitromethane...that'll wake things up for a few seconds;-)

Jonathan

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Blue Ridge Mercedes
Jonathan Hodgman
http://www.blueridgemb.com/
Enthusiast Service, Restoration & Tuning.
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Located in the Atlanta area
Specializing in all pre and post merger AMG's including Hammers and DOHC M117 engines.
Mercedes Repair Atlanta