IMO the 25 wide is the way to go. It has the same BTU as the standard 34 but as you mentioned because the top of the 34 is blocked the 25 wide does a better job. Honestly though unless you have a good amount of experience and are pushing the car really hard, this setup will be overkill. If your car is a daily driver there is the downside that it takes longer for the oil to heat up. It also will over cool the oil when you aren't driving it hard, even with a thermostat on it. You will also need to put a block off plate over it during the cooler months.
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