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cone filter adapter...the engine wont run right if you change the length of piping to the maf, ...its basic engine design, you need as a general rule of thumb 5diameters down stream from the maf, and 8diameters up stream...now most of the time there is no way in hell of getting 8diameters length upstream from the maf, so companies will typically try to just smooth out airflow, but that length of tubing from the maf to the throttlebody is what the maf is calibrated for, so when people change that length they always end up posting up wondering why their motor suddenly runs funny, and that may be why...back in the 80s ford actually had tunable mafs for this very reason of upstream and downstream piping lengths...so just leave the stock shit between throttle body and maf, its plastic it doesnt heatsoak and it bolts into the car nice, plus the according fittings really dont screw up airflow that much...
thats why i suggest just getting a maf cone adapter and make sure you either mount the IAT sensor on it, or right next to the filter somehow...i actually drilled and tapped in some inserts into my filter adapter and made my own gaskets and got the IAT mounted up to the maf adapter rather cleanly if i must say so...i did it on my beat old daily single cam...it helped a bit with throttle response, doubt it really changed hp...ALSO DONT USE AN OILED FILTER, it will eat your maf, get a paper element filter or AEM dryflow
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