What he said^^^
Mine really picked up some low end torque with the addition of the NA manifold, but with the way the torque converter slips, I really cant tell how much of a difference there is below 2k rpms. The engine revs to 2k as soon as you step on the gas if you are taking off. The top end power difference with the larger turbo is very obvious. Even before the intercooler, the NA manifold, or even the 2" charge pipe I had going into the front of the original manifold the top end power was much better. Mine was the same as yours, it fell off above 4k rpms. Now it pulls strong all the way to 5k untill it starts to defuel. I really think it has most to do with the tiny stock exhaust housing. Hell when I was pushing over 20lbs with the stock turbo it actually slowed down above 4k rpms... You could feel it plain as day! With the way the torque converter slips, my best power band is from 3500 to 5000, though I can build full boost by about 2800 or so once the converter is locked. I just adjusted the pump up a little more and burried the boost controller. I cant make more than 20 to 21lbs of boost, the trans just slips more. It will build more once the converter locks on the highway, but that doesn't do me much good. My clutch should be here any day...
Jason
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