Were there 2 resonator's for the t-maxx like there were for the revo? One was 2 chamber, one was single chamber. I don't think either existed the last time I had a t-maxx... but I did try the dual chamber one on a 2.5R revo and it wasn't any better than the stock pipe with the stinger drilled out.
The 3.3 is ok, might be ok for a tmaxx, but IMHO, it wasn't a powerhouse. I doubt you'd have too many issues with it in your maxx. The older tmaxx was known to have forward/reverse primary gear issues though, even in stock form. Most would replace it with a forward only conversion, then the...