I have a Mk1 Uno running a 603b ECU , I also have a 604B ECU sitting in a box in the garage, can anyone tell me the difference and which one will provide better Performace, details of my Uno are below. Note the exhaust has no Cat

K&N air filter
Upgraded intercooler
8mm Spark leads
NGK Iridium plugs
Adjustable cam pulley
Adventi ported inlet manifold
Adventi high rev cam
Adventi heavy duty valve springs
Hybird turbo, similar to T2
Trust BOV
Oil cooler
5th injector with in-cabin adjustment control
Dual stage in-cabin controlled Turbosmart boost controller
Catch tank


Sorry i think i did a double post :s