Hey guys

Car: 2008 g37s 6mt.
I just ordered some berk test pipes (non resonated) and am debating if it makes sense to get some Megan y pipes or not.
Exhaust will remain stock as I like the stock cbe and am looking
To only remove the real hp hoggers.
My concern is with the piping diameter size.
Will the y pipes hinder it or not.

Btw uprev tune will happen after install.

Thanks!