Haven't run e85 yet. Took the car to get dyno tuned and the data log showed the car pulling timing like crazy on 93 due to knock. I suspect it's the exhaust system that I had to custom make to fit the headers. So I'm ordering a resonator delete and put the oem system back in with the direct connect mids and see if that eliminates the knock and then we will tune for e85
Just curious, is there ample clearance between the mid pipe and floorboard? If not, that could be the cause of your engine knock. I don’t have this problem, but I do see how easily it can occur with just 1/4” of clearance between my mid pipe and floorboard.
Dang alright just wanted to see if you found a fix for it, I’m working directly with sct now. I’ll reach out if I get it figured out to let ya know!
The 3 inch mids run right close to the trans cross member those may be hitting as well. I had to cut up my mbrp h pipe and and make it work to go full 3 inch. But I don't think I'll lose that much power going back to the mids that connect to the oem exhaust with a res. Delete and an axleback. It's also very close to the sway bar by the rear hangers.