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Originally Posted by My5ABaby
So why did Mazda even make a 6 port?
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If you look at my mileage numbers above you will see that they were better on gas. They also would probably make better low-end torque if that awful mess of an upper intake manifold were to be replaced with a decent aftermarket one and some ITBs.
Some day I intend to build a max-effort 6-port with a custom upper intake manifold. I saved 2 sets of irons to practice with for the porting (filling the top of the aux ports will probably prove to be the most difficult part).
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1986 GXL ('87 4-port NA - Haltech E8, LS2 Coils. Defined Autoworks Headers, Dual 2.5" Exhaust (Dual Superflow, dBX mufflers)
1991 Coupe (KYB AGX Shocks, Eibach lowering springs, RB exhaust, Stock and Automatic)
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