What did it run/Dyno? Do you have any data? Re-stalling down is what this engine here needs. Not up. A good Intercooler would help a lot. As would any cleaning of the heads. Even a good valve job and 3 min per bowl clean up would be a game changer.I was running similar valve springs. But I had a large FMIC that may have helped. The re-stalled D5 eliminated problems with spool up. If anything, I wanted to slow down the spool to keep from blowing the tires off.
I was down around 25 psi, so the turbine wasn't quite all-in. It did pull nice right up to shift point. A great combo for the street, as long as I had traction.
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