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Discussion Starter · #1 ·
I've got a 290hp GM Crate motor in my '78 malibu classic. I've been running the stock exhaust manifold and and two 1.5 inch pipes...no H or X pipe connection. Does anyone know what the HP increase might be if I install block hugger headers and go for 2 inch pipes with an H or X connection?? Any suggestions on this?
 

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I would suspect you would see an increase of 20-30 HP, but I bet the 290 rating on your motor was with headers on the motor when it was rated.
 

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Discussion Starter · #3 ·
Would you suggest H or X pipe?? I'm not really sure if there are clearance issues using either one with my body style. Are 2inch tubes the best size for my application? Are block huggers better than shorties, or does it make a difference?
 
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