So I have an Invidia dp with the divorced wastegate, and I'm having problems at high boost with my boost spiking. It's only for 100 rpms, but I'm hitting 24.8 psi on a stock vf40. I have my wastegate duty cycle set to 50% on a GM EBCS at 21psi. I'm kinda thinking that the problem might be that the wastegate flapper is hitting the divider in the downpipe so it can't open up enough to keep the boost levels at the set amount. I've heard that this can be a problem, but never any first hand accounts.

Has anybody here ever dealt with this situation before?