Aww shucks guys.... 
I just try to help when I can.
To answer your question Inhaler, at certain power levels, the GN-1 heads will suffice, but if it were me, and I was going to max that turbo out, I would be running a set of TA Performance race heads. That's just my oppinion tho. I ran converted 8-bolt to 14 bolt GN-1s on my 274 Stage II, into the 10.00 - 9.90 range with no issues. The cfm rating is going to vary, from engine builder to engine builder, so I'd recommend you talk to a reputable engine builder who knows about Buick V6 turbo combos. Give Dan at DLS Engine Development a call for the TA Performance heads. He's been perfecting these combos for the last 15 years. Here is the link to his site. Home
Hope this helps.
Patrick
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Torrid Red '05 A4 GTO. Baseline best of 13.34 @ 105.9 with only a K&N CAI and a Flashpaq.
Dark Blue Metallic, '87 Turbo T. Best 60ft 1.65, Best ET 11.72, Best MPH 115.41. Her name is Sarah, and her words of advice are, "Always make sure, the juice is worth the squeeze."
Dark Slate Gray '86 T-Type RUQWKNF, Best 60ft 1.45, Best ET 10.07, Best MPH 135.6. Sold in '05.
White Chrome '87 Turbo T Limited, RARE T Best 60ft 1.52, Best ET 11.07, Best MPH 120.7. GM High Tech Magazine, Nov '98 issue. Sold in '98.
http://s78.photobucket.com/albums/j9...o%20T%20Sarah/
Former PTE Territory Sales Rep '01 - '06, #1 Salesman 3 years in a row.
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