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Not really, though I don't know the size of the stock outlet on the 334T, but since it is a larger engine than the 2511, it will need a larger opening than the 2511. I can understand using small holes, but try to have a total open area almost as large as the exhaust port. I think 85% as large as...

One 3/8" hole is a bit bigger than 3x 3/16". I'd go 1x 3/8 as a minimum on 2511t, max I'd do is 1/2" which is 2.37 times bigger than your 3 holes.

In my opinion, it is a common misconception that tuning is required after a muffler mod. It may make it easier to hear what adjustment is needed, and it may affect idle in some way, but I wouldn't worry about it too much, just see how it runs. You'll have to search around for how people have...