Even assuming (optimistically) that the stock FMIC has a core that's as efficient as aftermarket ones, a bigger surface area will simply dissipate heat faster given the same amount of incoming airflow and the greater thermal mass will simply absorb more heat before being saturated. Workshops can use what they want but no one can defy physics. Picking up 'lost' boost pressure caused by the restrictive stock pipings should give you power liao!Īs for the capability of the stock FMIC, I think there have been enough tests, even local ones, to prove there's substantial power gains to be had just by swapping it out for a more efficient unit EVEN on a stock Evo. I think its realistic to expect a power gain with these kits over the stock pipings simply because the stock pipings suck! Especially the stock lower piping between the compressor housing to the FMIC inlet. Personally, I will want a kit that has the shortest hence straightest pipings and one that's > 2.25" in diameter. To accomodate the straighter and bigger pipings, some kits require you to either relocate your stock battery or to use a smaller one. As for enhanced cooling, I can't be sure but I will guess no. In this respect, I think aftermarket kits help in maintaining boost pressure and reduces lag.
Of course, bends that are greater than 45 degree are worse. From what I know, every single 45 degree bend slows down the air velocity significantly thus increasing lag and probably causing a pressure drop as well. Most aftermarket kits probably come with a bigger ID but the important thing to look out for is whether they come with less bends as well. I guess the answer depends on which hardpipe kit you are looking at.
I noticed the MME E9 by ST Powered uses the oem IC. How much hp can larger diameter aftermarket hard pipes support? How much hp can the oem IC suport WITH oem pipes support?ģ. Without changing the oem IC, will just changing the pipes suffice to bring about better and larger air flow, and hence cooler charged air?Ģ.
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