i'm not sure about the regular fireball by 5Zigen
but the 5Zigen Miracle Fireball is not quiet at all!!...
i have to run it with my silencer in and you can really feel it blocking up...
only take it out when i'm at the tracks
and a few times on the street
wow i thought exhaust gives at least 9hp heheheheh i guess I was wrong hehehehe. i never knew there was another fireball exhaust i thought there was only 1 type does the miracle give more hp?? thanks a lot of the help guys!
A friend of mine installed the 5Zigen Fireball on his SI and yes it's better damn quite. almost like stock at some point. I'm considering this exhaust along with the RS*R EX-MAG as my next mod in the naer future.