ok......i have b18c1 in hatch, right now i have no muffler! my set up in my coupe was 4-1 header into 2 1/2" all the way back into greddy evo2 ( not cat, no pre-muffler). i went to track other day runnin very slow times 15.09 was best. i know it's back preasure,

q: is just puttin that muffler back on going to give me the preasure i'm lookin for or do i need to put something on b4 muffler to gain more back preasure??

q: should i change to a smaller canister'd muffler?