Headers - Exhaust

Aloha from the South Pacific.
Just as you can imagine the "Old Lady" March with its 998cc engine is starved for power. In an attempt to get this we beast to suck and blow like a goodun I plan to install a set of Aussie built exhaust headers. (NISSAN MICRA 1.3L 1995-1998 HURRICANE HEADERS EXTRACTORS). But woe is me, they are made for a 1.3cc motor.
Will this work just the same on the smaller 998cc capacity motor or am I just farting against thunder thinking even about it?
All the best.
 
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