ok so i bought a bone stock 91 coupe from a pastor back in 2008. he was the second owner(older gentlemen) and before that was a middleaged woman who owned it. it only had 102,000 miles when i bought it. again flawless and totally stock. the pastor only drove it on sundays. so fast forward and im doing a rebuild and a turbo project and when cleaning the parts and painting the keg i noticed that the front cover had a sticker on it.....at closer inspection i realized it said n326 now could this be some thing that mazda did because they had only s4 front covers or something.. the only reason i would think this is because since my ar was practically one of the last rx7s maybe they ran out of certain parts and threw an s4 front cover on..

anyone has any better ideas please let me hear them..
also whats really the difference between s4 and s5 front covers? is there a difference or is there only a difference between na and tii?

 

The sticker could have come from anywhere. None of mine have ever had any on them. It's very easy to tell if you have an S4 or S5 front cover. If you have a mechanical MOP/OMP, you have an S4 front cover. If you have an electric MOP/OMP, you have an S5 front cover. The pumps can't be interchanged between series. The NA vs. TII difference is the oil return connection for the turbo.

 

Ok well I removed my omp and I need to tap the front cover so I can run the oil line.. I will try and figure out if it's an s4 or s5 front cover