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I'd be inclined to get a standard zorst on first with standard cat if poss to see if that makes up for it.
Might just be a badly cast inlet that's causing the issues.
cat and zorst will easily rob 5 brake get them to fcuk, look what a difference Big Iains car made with afrtermarket manifold and zorst, madness!!!
Get a matched inlet too.
at work we have 3ft tall ballards which slide into a hole in the ground when not in use. We got ram raided so got these as they can withstand a lorry at 30mph apparently... lol
I made my own last night, will get a better pic later:
Fit's perfectly in the shorter French recess
Have run the edges through a sander at work and rounded the corners since pic was taken.