USDM ITR vs JDM ITR Exhaust
Posted: Mon Mar 20, 2023 8:26 pm
I figured i'd list this information here since it took me a lot of time to dig through old threads (honda tech, B20 vtec, K20A, etc) and still come up blank with only the CAT measurements. I recently pulled out my old ITR exhaust and was trying to figure out if it was USDM or JDM. It took a few ITR owners and I to get these results. I will upload the photo's for future referencing when possible.
Essentially the results were as followed:
USDM ITR Cat: 17 inches
USDM ITR B-Pipe: 24 inches (Cat flange to first resonator) & 72 inches +/- .5 (from flange to flange)
JDM ITR Cat- 12 inches
JDM ITR B-Pipe: 29 inches +/- .5(Cat flange to first resonator) & 77 inches +/- .5 (from flange to flange)
The 5 inches loss and/or gained in the Catalytic are made up for in the in B-Pipe
USDM and JDM will measure out the same when both Cat + B-Pipe are together.
Essentially the results were as followed:
USDM ITR Cat: 17 inches
USDM ITR B-Pipe: 24 inches (Cat flange to first resonator) & 72 inches +/- .5 (from flange to flange)
JDM ITR Cat- 12 inches
JDM ITR B-Pipe: 29 inches +/- .5(Cat flange to first resonator) & 77 inches +/- .5 (from flange to flange)
The 5 inches loss and/or gained in the Catalytic are made up for in the in B-Pipe
USDM and JDM will measure out the same when both Cat + B-Pipe are together.