hello all
please help me out here, Im getting a Seagull razzle and im looking to put a 90 size engine on it ive scopped out the supertigre G90 so far to be my preference but ive read a few posts from people saying that the stock muffler "dosnt have enough volume" for the engine and that the stock carb is a 60 size and chokes it?

i havnt herd much about the magnums but i have seen that the stock muffler is larger

price difference is about 8bucks

so my question is, which engine will be "better" (by better i mean more out of the box performance) for my seagull razzle

thanks regards
james