With stock exhaust ports, down pipe, RB cat-back, and a high flow cat you likely wont have any trouble with boost creep. If you go with a resonated mid-pipe then you might have something to worry about.

Thanks for your help guys, I think for now I am first going to purchase some FEED sideskirts and either the 99 spec or FEED spoiler.

I run a rx7store hiflow cat and I spike like hell. will fix it hopefully with BC.
No creep.

Mods= intake, DP, HFcat, cat back all 3", PFS SMIC, HKS elbow, Knightsport ecu