Acceleration Surge After about 5 mins

Jordo!

could be an intermittent vac leak anywhere before or just after the primary O2's. The surge would be from the ECU dumping in extra fuel to try and maintain stoichiometry for the unmetered (by the MAF sensor) air it picks up.

Check for vac leaks around intake and exhaust components before and just after headers.

Might also be a clutch slip issue -- not as familiar with those problems here, so just speculating.

Any CEL light / codes?

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Enjoy it. Destroy it.

Trilitheum

I think it could have something to do with engine, catalyst, O2 warm up, etc. Most mornings when it is cool on my way in to work I get the slight surge at almost the exact same place every morning.

I pull out of my driveway and onto a 70 km/h flat road with no stops or turns for ~15 min with little traffic, so my throttle input is pretty much constant. If your commute has lots of stop and go or throttle changes I don't think it would be noticeable, but it is for sure there.

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2011 Nissan 370Z Touring/Sport, 6MT, KAD