Yupp, Fram equals bad, put a K&N filter on it now.

6500rpm? Powerband isn't even starting if it's a ported MFR motor.

i put a stock 12A air cleaner on it, and mufflers. it feels like it making stock 12A power by about 3k rpms, and then it starts pulling hard to like 6ish, then after that it kinda goes flat.

its fun as is, but i realize from 7000-9000 is another 50+ hp!

You could completely change that with a different air box, and header/exhaust etc.
The stock air box doesn't supply even the stock nikki with nearly enough air.
I'm sure you know that though.
What seals you running? I wouldn't run steels over 8500rpm.

Two words: Destructive Testing.

Before I swapped out my engine, I had my original GSL-SE 13b with 97k miles that I had run to 83k or so a few times at WOT on the race track with absolutely no issues. I have found that engine to be pretty much bulletproof. I would not do it though unless you plan on swapping your engine.

the stock box should be plenty for any stock 12A, actually, if the P port is happy with it to 6500.

but yes, the new airbox/intake setup is in the planning stage, i want to run the comp setup, but my radiator won't move over far enough to do it

exhaust is going to get redone too, the presilencers lasted 9 half ass laps. i also want to find the right header length on the dyno

i'm running carbon seals, on a balanced rotating assembly, it goes to 11

Try to run a big of filter as possible, for a Periph 12A mazda calls for at least TWO 6 INCH round tubes.

As far as exhaust goes, on a PP it's allllllll about the length of the primaries, they need to be collected at the 7.5" inch mark.
I'll take a picture of my Downing 13B PP header when I have a chance this weekend and PM you the pics, I also have a Downing Header made for my 12A Monster Port for a tube chassis car that I'm copying to fit into my car, the car the my Monster port is currently in. The primaries and collector is actually bigger on the MP header than the PP header, BION. Like I said, I'll take pics.

On any periph, I stay with Ceramics. But I know, I know.. $$$$$..

yeah pics would be great! i just have RB headers now, i built mine based on the competition book, so i wanted to go with a 90" header, although its more like 72" cause i didn't tell the fab guy IT MUST BE HERE.

but since it melted, system 3.0 is in the planning stages, i was going to make it adjustable length, just so i could go to the dyno and get it right.

Will get pics ASAP! On the side of the road with another collapsed oil filter..
I think maybe I need to take this race pressure regulator out and swap it for a stock one..

Pictures as promised.

Last picture is of one i'm trying to sell, produces way to much power above 8000 rpm, and less broad power than the Downing.

More. :)

interesting, that first one almost looks like a turbo manifold

The reason for the loop is for length, increases torque. Longer the length after the collector before the muffler the more torque, and same for the primaries. Longer the primaries, the less torque you make which is exactly why I don't like RB's exhaust headers. Or the long primary system in general, on a side port engine it works wonders. But on out big port engines it hurts low end performance, which we do need.