When given the opportunity by joe and dan at ppe to switch from what i was running to there NEW design headers and up pipes, i asked joe if he would please strap my bellows on the up pipes as i have had to over the last few years...His reply was NO... these will hold.. as i was on a beta test for this product i did not argue with him!!! To be honest i did not have the faith they would hold with out straps.... About 6 runs is what i could run with the previous product. As you seen in the pic after whats been stated for events held on the new product, there still perfect!!! I have full faith at my power level these will continue to hold!! Even at this point if there was a failure, i could not complain, as they have performed great on overkill... I dont know the details guys on the differences, im not here to start problems.. A few people wanted my opinion on the previous thread. These are the facts, tested and proved on overkill, i have put them through hell. Just my 2 cents everyone..