| what is the most approprite exhaust size for a 998s engine?
for example running with revised cam timing and approprite ecu?
what is the most aproprite axhaust diameter to run with the above,
one place tells me 60mm the other tells me 57mm and that 60mm is too much?
It would be good to hear from anyone who has run either system, even better if youve ran both at differant times on the same bike.
im looking at buying a bigger system and anm not sure which to focus on? | 
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