I have heard that if you are driving it on the street, you need mazda seals. The 3 - piece seals make better sealing at low revs (like starting). Unfortunately, I just bought some seals and they don't sell the 3-piece seal anymore.
I am using Mazda seals (they ran the first 75,000 miles just fine, 200,000 in my NA).
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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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