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The rule of thumb goes the larger the tube size the more PEAK HP you MIGHT be able to make, buy you will pay a price in the low and mid range power.Also you DO NOT want a 4 into 2 header, you want a tri-y.
I am trying to build my own headers for Hayabusa (Barracuda), wanted feedback about whether I could use 1 5/8 OD as opposed to 1 1/2 OD. Reason being, I found a very cool prototype system for designing and fabbing headers, but smallest OD is 1 5/8. Any input would be greatly appreciated. Would like to go 4 into 2.
+1. or at least a 4 into 1.