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Well the resonator would be a good "filler" for that space but, wouldn't this increase back pressure?
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It works great, if anything it's still overkill, no added backpressure whatsoever. (which wouldn't matter anyway since it's not turbo and the whole backpressure thing is all crap anyway....) It's 3 inch and flows 10 times better then the dummy cat since the air flowing through the dummy cat expands in the center and than has to contract to squeeze out the other end. Running the resonator on my car with the N1 dual and no turbo had no real affect in performance either way, just a cleaner tone.