Hi Woodie, After installing the crossover manifolds on my SRT6, I did a dyno run. I am listing the results below...

before crossover manifolds my AFR at 6200 rpm was 12.5 (a bit too lean) and wheel horse power was 340hp
after installing crossover manifolds the AFR went to 13.8 and wheel horse power was 296hp - no doubt because the ECU was pulling timing to prevent detonation.

So, after confirming that there were no air leaks as a result of the installation, there was only one change made. Crossovers. So, while it must be true that there is lower pressure on the fuel injectors, that does not help increase fuel delivery if the pump is maxed out relative to the additional oxygen/air being delivered to the cylinders. At least that's what the data from my N of 1 testing reveals.

The good news...there's a lot of additional air getting into the engine, especially at and above 4k rpm!! I expect significant gains therefore, once the engine gets more fuel...thus,

The bad news...I need more fuel flow. I'm hoping that adding the sl55, pn 7.00228.51.0 fuel pump will solve the problem.

any observations and/or suggestions are welcome.