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matthewcassity Some maybe dumb questions but are you sure the valve is opening up on your exhaust? Peek in there to see. Also, you are 100% sure you have the M perf axle back?
If it's closed, you wont get much volume vs if it were fully open. Do you have a way to set it to open on command to see if it is functional? Like BimmerLink or MHD wheel control?
As a last resort you can physically check if you have a catless downpipe. They may have mixed something up, you never know.
To do so, unbolt the flex pipe that connects to the downpipe and move it enough just to peek in there. If you see any catalytic material you found your issue..
I'm just brainstorming out loud here trying to help you out buddy.
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'15 235i - Moddedededed
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