i haven't done a mini-me swap, but from what i've read it get's good hp gains. it's also alot easier than a complete vtec motor swap. if the only thing wrong with your si is that it dosen't have vtec. From what i've read wiring is the easiest, of any swap.
I haven't seen anyone claiming that it was the *poop*. Mini-Me is a good inexpensive way to get a good power bump out of a non-vtec engine. Depending on what head/block combo you have, it can also add a rather substantial bump in compression.
as for whether or not it is worth the effort... that really depends on which engine you currently have. Also if you are doing a mini-me, then I assume that you have a non-vtec motor. You would also want a tranny that came with a vtec motor as well (z6/y8). They have much better gearing than any of the other d-series trannies.
If you were to do a mini-me with an aftermarket cam and the z6/y8 tranny, then I think that you would be quite pleased with the outcome.
When I put a 98 Y8 Head on my 96 D16y7, there was a noticeable gain in power. Im not talking about a HUGE difference, but it was "noticeable" Throttle response was better for sure.
With and without VTEC hooked up.
I got the whole Y8 engine for $50, with a bad bottom end.
It's worth the time and effort, (took about an hour)
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