Was GTM the source of the 550/410 numbers and this is the first independent test?

Do you have another map on there it could have been switched to by accident?

It has two maps, but that's beyong mild and aggressive. The highest one was with meth. I had issues last year on A Mustang dyno. I can link that too

Yeah. That's not going to account for that kind of difference. Any trap speeds to verify GTMs claimed numbers? Something's way off on that tune.

Nothing. I'm way too busy to do anything atm. I messaged Seb a few days ago. He wanted proof it needed a tune. This is definitely proof.

I decided to try my resonator on my Y pipe. It's a bit louder than my CAT, drones a tad bit more, and has a more aggressive tone. I'm sending my logging and dyno info to SEB and Uprev for opinions as well. Today though, the car felt it had a lot more power. I had a passanger and a full tank of gas and 2nd broke loose around 3500-4krpm which I thought was interesting. Not sure why the power difference, but the only change was from CAT to resonator.

I called GTM and spoke to Sam today. Literally one ring. He remembered me instantly and was happy to help me troubleshoot. I told him my power numbers and he agreed something is wrong. He asked for boost info but didn't have. So he's sending me some info on getting some more monitoring on my car. I agreed that I definitely need some way to monitor it. I'll update on my plan.

With two blowers, you might be maxing out the MAF's, even if you have wider diameter intakes and corrections dialed in.

Check MAF voltage -- if you are hitting or just skirting 5v, that might be the issue.

I'll have to look at the logs. I don't think that's the case though, those intake tubes are 3" at the maf.
I'm suspecting a boost leak somewhere.

Very possible -- do you have a boost gauge? Any weird hisses?

Another possibility is the IC isn't optimal -- can you log post IC air temps?

Looking at my MAF logs, one side maxes out at 4.7 (B1), the other at 3.8 (B2).
When the MAF GM/S reads 268.9, thats when the above readings occur. One side is always higher than the other. Not sure if that is an indicator.
AF-CORR looks the same on both sides, again... No clue if that tells me anything.
Intake temps were mostly between 75 and 85 on a 60 degree morning. It rose up to 110 at an extended stop. Huighest temps in motion were about 97F when running it to redline at around 90-93 mph.
Coolant temps reached up to 204, but stayed mostly around 180. Same with the oil temps.

I'm dropping my car off Sunday to JENZ's house so her bf can bring it to work with him to do a boost leak test, compression test and test how much boost it's making. I'm thankful he could help me out as I keep going out of town and don't have time to take it myself. Once I have these results, I'm hoping it tells me the culprit so I can fix it, strap it down and see if it is taken care of and see if the car gains back this missing 200whp lol. If it doesn't, then the question become, does it need a tune or is it tapped out as is?

I have the logs if you or anyone wants to look. I can email them if you pm me your info.

I have a feeling its due to nearly maxing out the one MAF (on a cool night, I am sure you see about 5v) while the other is measuring a much lower voltage -- they shouldn't be that far apart. I'm not sure how the ECU interpolates the values between MAF's, but that could very well be it.

AF-CORR is probably just the fuel trim, so if they aren't too high and about the same for each bank, that's good.

Post IC temps sounds good, coolant sounds fine, I'm guessing oil is fine, so other than a boost leak or an undersized IC causing blowback, my money is on the nearly maxed MAF.

The only other thing I can think of is that if you have OEM VVEL dialed in, there may be need to be some adjustments to better accommodate the extra air mass -- too much overlap will blow the mixture right out before achieving peak torque; too little will cause blowback.

Good luck!

How is AF correction nearly the same between banks even though the MAF voltages are so far off?

Not sure. I can send the referenced file. I wouldn't let me upload it here lol. Unsupported format.

I couldn't open it at work anyway. That was just my first thought when I saw your post. If the MAF sees that much more voltage/airflow, how in the world would you have similar fuel trims across banks? That screams "problem" to me.

I finally evened my debt for Phunks road race pump. he was super patient with me and I'm grateful for that. Woot!