Yup, mine is 500+ hp. I ran a best of 11.48@ 117 with the Schumachers through 3" exhaust. I had modified my Schumies by cutting off the 2.5" collectors and going to 3" ones with V-band flange connectors. If you go to my picture gallery you can see how it was done. Not sure how much that helped because I never ran them without the mod. I now run Bob Mazzolini Propart headers, they are huge 2 to 2 and 1/8 step with 3.5" collectors. Best with the big headers is 11.125 @ 121. I'm not sure how much of the gain is from the headers because I discovered that I had been running lean with jets that were too small when I had the small headers on it. My guess is that if I was not lean before the header swap it would have been running 11.30s-11.40s. With that said I estimate the Schumies were only costing about 30-40 hp and a quarter second in the 1/4 mile. The Schumachers are not nearly as bad as most guys think and like I said, life is easy with them, tons of room left in the engine bay.