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H is rated for 130mph, the stock 850 / 70 class top speed (controlled by ECU). Load factor on my S70T5 was 89. If you've upgraded the ECU, you'll have to upgrade the tires accordingly. You'll probably find the correct rating in the owner's manual...and any reputable tire retailer will have it in their database.
Here's an informative explanatory chart - http://www.tireguides.com/tip2.html
If you like to really fly around corners, higher rating such as V would be OK, especially for turbo but it will cost you more.
For the record, I just put Michelin Pilot XGT H4 on my car for $130/tire plus balancing - more comfortable and grippier than my previous sport tire (which were a CR best buy, hah! ). Michelin also catalogs Pilot XGT V4 (V-rated) tires.
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(98 S70 T5SE misc mods - mostly lighting - and red calipers) (92 940GLE)
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