I put these cams in last month and had a tune by Dyno4mance in Calhoun GA. Very pleased. Stock turbo, MBC @ 22, TBE, no cat. Very smooth, great top end, no noticable low end lose. Idle is like stock with nice lope, not too aggressive. Could not be happier. Someday a 20g and a new tune. 2003 VIII with 100K, runs great.

 

I have had these on my Evo 8 I also sold these to many customers. Very very nice cams!

Lets speculate for a second... XS is very close to Cosworth, they work together on a lot of stuff... Also Kelford... Maybe just maybe they have the same maker.

But its speculation.

Evan Smith