Race or not, your not anywhere near making 1200 whp, so your needs are different than Shep's. Putting his parts together for anybody else doesn't equal 7's.
Put yourself in AMS's shoes. Every 18 year DSM'r in the country reads that Shep runs 7's with their manifold. I bet their phone is ringing off the hook with people wanting that same manifold so they can go fast. I'd say they're just being realistic. Marco's take is a bit different. If you've got the cash, he'll give you whatever you want, no questions asked. Marco's a true salesman.
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