I have two of them. I used an electric one. It is very smooth and powerful. I blocked the three other holes. There was a leak of course at the pacesetter manifold connection. There always is. It’s not a big one. I tried to get something done before at two of the local exhaust shops. They wouldn’t touch it. I just jam red high temp RTV around the leak. I’ve been dealing with this for 7-8 years now.