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Posted this is SF as well... I currently have a to4 with a .58 a/r exhaust, on center single inlet with the standard 4 bolt outlet/downpipe flange. The thing is the unit is really to small for what I want (400hp or so to the wheels) and it needs rebuilt. So I have been looking and...

I have a problem keeping boost up at around 5k and up to redline. Down low and in the midrange of revs it actually spikes a little bit but then drops down, again at the upper revs. I have a stock ct26, full hard pipes 2" into the intercooler and 2.5" out to a 2jz FF upper intake, 24x12x3...