Bro jackylsp:
Since you posted dyno chart:
1foot-pound=1.3558Nm(approx)
Power( hp)=Torque(foot-pound) X RPM divide by 5252
Assuming both runs have same horsepower@7500 I will prefer 1st run where the torque comes in earlier and smoother.This will get you to top speed faster.
In Dyno the torque WILL always drop @ 7000+ RPM because there is no effective way to measure it.The only way is to apply enough negative force @ 7000 rpm until the clutch slips and that will not do any wonders for your engine.
Q:this is @ flywheel or at the wheel??
Hope it helps!
---------- Post added at 11:16 AM ---------- 6 hour anti-bump limit - Previous post was at 10:57 AM ----------
IIRC, straight flow shold be better in low end, not top speed. As per my own experience, I was using TRD s-flow, top speed can easily hit 180km/h but after fix straight flow trumpet muffler it seems like a bit slow to hit 180km/h.
Depends on level of mods:but straight flow IS better for top end.for example super saloons all run side branch -no muffler
Thats why they have so called 'tuned exhaust' systems.Its not just for the sound!!!