I say you will gain no more than 10rwhp. Good luck... 
Just ordered BBK Headers!!!
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TECH Enthusiast
Joined: Jan 2004
Posts: 611
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From: Fairfield, CA
Just ordered BBK Headers!!! I know they are shorties, but I need to be smog legal and they are as close as I can get. 1 3/4 primaries and I got NGK TR55s Taylor 8.5mm wires, and GM gaskets and in a few weeks, carsound cats and custom 2.5 inch y pipe. I am expecting 15-20 hp, but we will see. The real test is at the track and SOTP. I'll let you know how much I love it. 
Originally Posted by 2ndGenWs6Owner
carsound cats and custom 2.5 inch y pipe. I am expecting 15-20 hp
Well, the BBK headers are a huge improvement over the stock manifolds. Mine had welds hanging down into the exhaust port of the header, about 3/8" to be exact. And their design isnt to hot either. I would expect you to see about 10 rwhp from them. I know the pain it is to be in Cali, but I don't mind having to put the stock stuff back in come smog time 
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