Can someone please give me links to ESR vs. Pro-X discussion

[Derrick Adams]

I'm having trouble with searches for this. I would like to know the pro's and con's of each cylinder vs. the other.

Thanks!

[Honda 250r 001]

well theres not much difference in the cylinders but i fear that they may have a problem cracking or somehitng like the early pro x cylinders and early atc cylinders.

The pro x has a bridged intake, i odnt think the esr has one.

The esr has a really neat head but not sure how well its works, the pro x head is plain and is not adjustible for a spacer plate.