12 bolts are good for auto's 9" is good for 6 speed as far as mild street strip cars go. ive seen Way too many 12 bolts go boom. John a handfull of times. mikes makes noise. Adam(nemss) has had a few issues with his setup. and thats all 3 people i know that own them personally. go on tech and do a good search of the reliability. Thats my opinion only But they SUCK!
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1998 Firebird:buncha parts thats used to make it go fast..... not so much anymore. 
BAAAAAA!!!!!!
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