Installed the WeaponR headers today. Luckily they are a direct fit. Spot on. Im happy about that.
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Now, as for power increase. 3-5kw mostly mid range, a tad more power duration at top end. Drives better than it dyno'ed. Much more free revving, better pedal feel, quicker rev drop once the foot is off the pedal. Far smoother power curve, More power up top ( all these things are personal interpretations of the feel of the vehicle) the driving feels better than the dyno results.
I must say. I still think im down on power since the fumbled Toyota service/injector clean/ oil change. As i mentioned, it felt like turd once i picked it up from Toyota the other day, almost in limp mode and it wreaked of fuel. Initial dyno results came in 12% under previous run after the exhaust. No dyno has been done since the CAI install so i cant discount that either. Weather was very similar both runs. It feels better now than when i first picked it up from Toyota, but still not on song. SO, i would estimate almost a 20% drop in power post service/injector clean/oil change.
I see the variables as this:
1, Something happened to the injectors when cleaning, or the excess fuel screwed the cat, but its the most unlikely of the variables.
2, The 5W-30 Castrol Edge Sport is too thin, and causing Cam timing/ VVTi issues. - Possible/very possible
3, Toyota updated the ECU software and wont admit it. This is highly likely as my tuner has seen this before. Toyota (and other) manufactures will not admit they update the software version, as it could cause legality issues if there was/is problems with previous versions.
So yes, Im happy with the feel of the headers and their effect on the power and smoothness, especially for the cost. Im still not happy and cant chase this issue of lower power.
I wish someone would crack that dam Toyota ECU security coding so we can flash tune this POS!!