tegiwa. Nice and an everyday exhaust.
Martelus is for those that want to be the center of atention.
HA! Thanks Nuno
I would say the Tegiwa would be better quality (not anything to worry about) although obviously everyone knows about the sound the Martelius makes. The Tegiwa one I believe is quite quiet and suitable for track use, which the Martelius isnt..
Both are single side so youve got the flow benefits in each. The Tegiwa one tapers at the end though so Im not sure if that will affect performance or not, the Martelius is 2.5" the whole way. Im sure you will be happy with either depending on what youre after. If you dont mind turning heads from miles away Martelius will be ok, it is super loud though.
Every day option like Nuno says - Tegiwa
Weekend use - Milltek/Martelius