The problem with the roush aluminum intake manifold is it also has the hot water cross over built into the leading edge.larger HE and reservoir will not solve heat soak issues. The aluminum intake and blower get to 200F. I run a stock 2013 GT500 degas bottle and it is on a "bypass branch" that is restricted on the inlet and runs out, up, in and out of the bottle and then back down to my 2013 GT500 intercooler pump located ahead of the driver's front tire. This way the line from the intercooler rad return has a straight shot to the pump inlet, and any gas gets up and out of the circuit into the degas/fill bottle. Larger reservoirs are great for adding weight and making it take longer for the system to cool back down once you're rolling.
I wouldn't run the alt backwards because I would be spending too much money on sleep aids and anti anxiety medication, and grease to smear on my glasses when I had to look at it.
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What HE are you using ? Cruising in 70-75F summertime heat, IAT's are typ 120 F.... and drop a bunch with gas pedal mashed, blower on. Just cruising, and the air is traveling so slow through the intake manifold, it gets re-heated. Drop down a gear or two, or get into the gas a bit ( blower off)..and now the air travels in + out of the hot al manifold quicker.