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The exhaust manifold on my GT is connected to a dual leader pipe which then tie together about 24" down stream; which we will call the collector for now. I don't know if this is what is ment by a 4-2-1 design, but the distance is the same from the manifold flange to the collector on any one of the cylinders. The inner pipe which takes car of cyls 2&3 is slightly longer than the outer pipe, which takes care of cyls 1&4.
I was originally thinking of separating the pipes and running a dual exhaust. But I believe if I do that I will improve flow but totally kill my low end torque.
What would be the better way to go?
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JB
Restore, Customize and Conquer!!!
'73 Opel GT Convertible "Stealth"
'70 Opel GT - 4 speed "Lucy"
'72 Opel GT - 4.0L V6 automatic "Animal"
'72 Opel Ascona 1900 "Junk Yard Dog"
'71 Opel Manta Automatic "Coco"
'72 Pontiac Ventura II SD455 "Monster"
'07 GMC Sierra 1500 - Daily driver
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