Very nice numbers! These Rotrex SC’s love cams and compression with E85. I went a bit to mild on my cams wanting to keep some low end grunt. By the looks of it you didn’t give up anything down low (5k)

Same 11:1 CR, C30-74, E85, 9si and Dyno for comparison. I also run 2.5” exhaust but use cheap eBay header.

Cam selection is key. I played with a few cam configurations to find this was the best combo. If I were to try anything else with cams it would be more intake duration to swing the peak power to the right another 400rpm but valve wear is a convent so I’ll keep it as is. I think this winter I will try to make a header In hopes of freeing up more power. The rb unit is great but I am certain. At this power level it’s a restriction.

I would look at the 2.5” exhaust closer before taking another run at cams. I bet that’s causing the restriction up top. I kinda doubt the RB header is holding you back.

When tuning last year I fought a similar power curve (lower numbers though), turns out I left my silencer cone in the exhaust prior to tuning. Once removed she pulled all the way through the top to 298whp. Kinda shows what exhaust restriction look like on the dyno.

You running Web Cams?

I’m not touching the cams I’m happy with the powerband but I think it could be improved. On the exhaust side. The idea will be to replicate an rb header with a Better merge and bigger primaries and step up to a 3 inch exhaust. I’m using Maruha cams