Need help selecting....

Pickuped an os .18 cvr for my mt1 but not sure which pipe would work best.

I read some time ago that the Ofna pipe was pretty good but it wasn't specific as to which one. Do you think the Ultra Comp pipe might do a good job? Is it too big?

What about the Associated RC10GT pipe? Would this be a better choice? The thing is I've found an Ultra Comp pipe (very good price)but not sure if it would work.

What do you guys think?

Thanks