I know that ets licp lp2 will fit the stock evo 9 i/c but wut about a ams short route uicp will that also fit the stock evo 9 i/c? will be upgrading to either 3.5-4" ets i/c is there a major difference in those sizes? will the 4 be more rewarding that the 3.5 in gains, etc.

thnx for the advice guys