Originally Posted by
lzylst
jdm ITR header is 2.5 inches at the outlet. Your connection is smaller.
which can be fixed with a 2.5" cat or test pipe. the main issue you are going to run into is oil pan clearance. i have the JDM ITR 4-1 header and it would not fit with the LS oil pan. i had to change over to a GSR oil pan for the header to fit.