It might make that difference.

I encourage anyone willing to take the time to provide before and after pics to do so. My USB borescope was $20 or so from Amazon, and I certainly don't have to have a monopoly on willing to try stuff.

One option that I considered, but ultimately discarded, was using a spray decarb chemical through the spark plug ports directly onto the seals, rotating the engine so that the seals could be optimally hit one at a time.

The reason I decided against this is due to the danger of having a chunk of carbon break off and not dissolve, then break a seal on next start up.

I also considered the ATF fluid soaking method, but couldn't reconcile the expected volume of smoke with what my neighbors would be ok with :lol:

Random sidenote, jdm rx8 tuners (RevoTune Japan specifically) use steam cleaning w/ water for decarbing quite frequently as opposed to things like seafoam/atf/etc.

Given that 1 gallon of distilled water is ~$1, and 1 gallon of seafoam is ~$87 + tax and they produce about the same result, I can certainly understand that choice.

dont you sass me

Yes sir.

Lol just did mine at my buddy's house the other night, I wanted to take pictures so bad of how horribly it fogged out his neighborhood. lol