B8 210 exhaust pipe and intercooler suggestion size

[adikgemok81]

Hello all ZTH members,

I am in the process on converting my Mazda BH to a B8 210 engine. I was given a free EVO 3 intercooler with the halfcut...i was wondering what suitable size for my FMIC piping and Exhaust piping.

Will be aiming for 1 - 1.2 bar on stock setup with Wallbro Fuel pump only.
P
Unfortunately today i bought a muffler at a chopshop with RAGE engraved at the tip...made some research and found this....
Stainless mufflers
The model i bough was the RX6280 with 63mm inlet size (around 2.5 inch)

My question is...is it ok if i pull out 3 inch pipe from the turbo to the 2.5 inch inlet? Will there be any drawback or something bad? Or i could get away with straight 2.5 inch all the way from turbo to muffler?

And what is the appropriate size for my FMIC piping size?

Just for info (if got many larr...hehehe) on future upgrade...

1. Custom banana for VJ23 stock turbo
2. FPR
3. EVO 3 or VR4 injector
4. Cheap fuel management like SAFC
5. BOV and EWG

With same boost target 1 - 1.2 bar.

Need advice...Thank you in advance...