Anthony, if I tell them I want the system to be fairly quite will this stop me making as much HP as possible. Or does it not work like that?
Do you want my old GT exhaust trim? 10 pounds to you, it cost me 50!
Have a look at this
http://www.btinternet.com/%7Emarkhorton/Power.htm
and this
http://www.fastcar.org.uk/MAZDA.html