Berk DP Question and Others Options

[XxDarkLightning]

I am in the (timely) process of doing a swap to my 98 Celica GT. I am at the part where I will be assembling manifold and am going to get the berk downpipe. My question is which one? I plan on running the stock ECU and not going to crazy with my car (for now anyway). It will be a three season vehicle here in MA. Is it wise to get the wideband o2 now in case I eventually put in a management system? Does the regular o2 sensor fit in there? Is the ceramic coating worth it or is it just marketing? Then it's a 3" outlet. Should I run 3" all the way back? I have seen that can result in boost creep.

Also:
How many gauges (and what should they monitor) would people recommend? I assume oil pressure and boost. But I see all this AFM, no AFM, temperatures etc so I am a little confused for my application.

Thanks all.

[Fate]

I am running a Berk 3" Ceramic Coated with wideband bung. *both wideband and stock 02 sensor are mounted. Full 3" exhaust with high flow metallic spun cat.

Stock ECU, 17lbs. No issues.

Gauges: AEM Boost, Wideband, Oil Pressure.

Hope that helps and best of luck with your swap.