Well, after a few run, butt dyno tells me there are more tq from 4000-5500rpm.

After I got my header/exhaust setup on, with intake pr sleeves, 4000-5500rpm always seems to be where there dead spot is.

I would have not much power from 1000-3000rpm
Then power from 3000-4000rpm.
Then power from 5500-8200rpm.

How do I know? I look at the y-axis graph with the airflow mode and before this mod, the afl would rise from 1000-4000, then flat to 5500rpm and go up again to 7500rpm

Now, after this mod, the flat sport has shrink to 5000-5500rpm.
Pretty good improvement eh?

What I did was made the aux ports open later and VDI open up sooner.

Oh, yeah, you guys probably want prove too eh?
I am heading to the dyno on 4/10. Please wait for results!