Has anyone here tried these exhaust cut-outs? I've been thinking of getting a set of cut-outs and saw these on Ebay.

https://www.ebay.com/itm/Custom-Sliding-Electric-Exhaust-Cut-Outs-2-1-2-By-K-Co/332780400739?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2060353.m1438.l2649