i talked to phil from philstireservice.com when i got my azenis a few weeks back. he autoX's with a gsr in i think H3 or H1? i have a bad memory, either way, he has a skunk2 and he said it has great gains and also is not loud at all. i think the racing medallion is one of the louder ones.

depends if ur going for straight gains, look, or sound.