When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
No. Solid as a rock. It's really the butterfly valve and not just the module rattling on the hanger?
Call them - the owner/designer of them often gets on the phone about any technical problems. I'm sure they'll quickly offer an exchange. http://www.powereffects.com/indexmain.html
I had the same problem, loosen the two bolts that hold the butterfly adjuster to the module, and then move the module around until the butterfly doesn't touch the module anymore and then tighten the screws.
When this happened to me, it was right after I installed the exhaust and used it for a while and I adjusted it once and haven't had a problem since.
The other thing I noticed on my power effects install was that some of the screws on the rear mount touched each other and made a horrible resonance inside the car, after trimming/adjusting the screws so they don't touch I don't get any resonance.