Only relevant factors for turbo function are mass and speed of the air going through the turbine. I don't know what the california modifications are but if they divert part of the gases that normally go into the turbo that will screw you up. Obviously hot will give you a little greater pressure and speed but the exhaust should stay very hot when up to temp. If you are really worried about performance check the intakes and filter which you sound like you are taking care of.

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My Daily : 96 E-300 Diesel with 195,000 miles
Retired: 92 300D 2.5 T 345K miles and for sale
Retired: 95 E320 157K miles and currently parked with blown engine

Both retired cars are for sale as is my w124 shop inventory