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You need to figure out what Seafoam can really do, and what you are after. So Seafoam would be introduced somewhere in the intake. Assume the plastic manifold and triangular green intake seals would be wetted with it. The polymers on those items appear to be robust so its a fair bet they would not be softened and swell up with Seafoam. After that its off to the intake valves and into the combusion chamber. The compression stroke is a little worrying as the engine is already high compression and any liquid will serve to raise the compression ratio, not that there is likely to be firing in a cylinder with Seafoam in it, but if enough Seafoam enters the chamber the loads in the engine will increase dramatically - not good. With luck hydraulic lock has not damaged anything, then its out through the exhaust valve and into the exhaust. The O2 sensors are likely safe, but what about the catalyst in the catalytic converters? You just threw a bunch of dirty hydrocarbon liquid onto them all in one go. Maybe not the best way to service the cats. I would also consider upper end lubrication during this process, is there any? So what Seafoam likley does is clean the intake and exhaust valves along with the combustion chamber. I've heard, and read adding Techron as a fuel additive does a good job at that and without the drama of Seafoam. But, if you do decide to Seafoam, post a video to this forum, the reaction to a high revving, smoking Boxster would be priceless. If the Boxster actually blows up in the process, it's legend.
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