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I forgot to add, per my own calculations, I figured about 365-375AWHP as a MAX output available for the modified TD04 turbos with forged pistons/rods and a drop-in K&N filter.
Mine is AWHP because I have a Cadillac CTS-4 AWD vehicle. I, like you, went with an upgraded TD04 (ZZP Big Wheel turbo) unit and a K&N drop in filter. I had Trifecta build me an Elite tune for the mods and I figure I am somewhere in the 325-335AWHP range. I figure forged pistons/rods would net me about 40HP more (only because of tune aggressiveness).
Again, with the more aggressive tune an upgraded intercooler just makes sense.
For my needs and use I am fine where I am, but I always like to have the upgrade path planned out for "what comes next".
For me, your kind of setup is exactly where my end-point would be, as I have torque limits of the transaxle, transmission and differentials to worry about.
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