Optimus485

I bought the JLT 123mm then found the 127mm Carbon Fiber. Is there any real performance difference between these?

05 Mustang

Yes. I believe the 127mm is worth a few more hp....and if you're starting from scratch, I'd definitely get the bigger one....but that's just me.

Optimus485

http://www.mustang50magazine.com/tec...l/viewall.html

Just found this article about 113mm vs. 123mm vs. 127mm CAI

According to the article, the 123mm makes lots more TQ and more HP all the way to 5,000rpms, from 5,000-6,000rpms, the 127mm takes off.

Personally, I'd rather have the power down low. More useable.

GT500Steve

No difference except the price. Go with the 123mm and save the cash. My car works just fine with it.

Blacksmoke

I'm getting this along with my Stage II package.
I was told the same thing.
No difference. 1-2 HP IF lucky but probably none, and perhaps a LOSS (read next paragraph).
Who does the tune will make more difference than that.

BTW... I've read an article or two where the bigger intake actually caused a drop in power because it was too much for a GT500 without some pretty good mods to make it need the extra air circling around. One article had to add a new throttle body along with it's new upgraded supercharger because without the TB it dropped in power even with a big SC upgrade.