i currently use the vantage pipe along with many of my motors:
JP Racing Mugen X12
JP Racing FX12 T-03MT
JP Racing FX12 T-03M
Rody Roem V12
Mugen X12
Sirio T3 STI
The pipe works great with all, a very linear powerband with plenty of top end. doesnt ever make my motor hot and will never change tune in the middle of a race thanks to consistent exhaust. (never dents or dings.
)
Although ive tried the EFRA 2630 pipe by Novarossi and LOVE it. awesome power, bottom, mid, top. everywhere. Power created by the pipe is AMAZING. But, only drawback is runtime. i lose run time significantly using this pipe. I'd use it for my mains.
The JP Racing 2620 is a little less on power, but run time is great. i recommend all 3 depending on what youre doing.
good luck!