Quote:
Originally Posted by JamesM3M5
I have a question for you / the gang: Would it be necessary for a DD to have an upgraded IC? Especially with meth?
Or especially without other mods (DPs, intake)?
The ETS probably has more pressure drop due to its stepped fin design, but does have good IAT reduction. The 5" would probably not affect spool appreciably over stock. Not a fan of the welded end-tanks without some sort of smoothing to allow flow back out of the IC.
I have a feeling that the available smaller IC choices have very little difference in performance - acceleration, spool, IAT drop - just like downpipes. Not enough to really make a hill of beans difference.
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Here is ETS' step by step upgrades with dyno comparisons:
http://www.e90post.com/forums/showthread.php?t=483840
There were no methanol runs but you can see the bump in power changing the FMIC only. I think it's not just about IAT supression, but also that the stock FMIC is restrictive at higher boost levels. With meth, you will still see gains with a better flowing intercooler. It just becomes less relevant between the smaller and larger FMICs (ie. 5" vs 7") with meth since it takes care of reducing IATs...