anything that is bigger is better. More flow is better for turbos.
Like i said its not gonna choke you down that much . Esp if you arent making like huge hp. I made almost 400whp easily with a catback Apexi N1, the 60mm version with the2 big ass resonators in it and a bootleg 2.5inch crush bent DP.
I then switched to a full 3inch mandrel system with no rsonators or cats off the turbo to a 3inch N1 muffler and it felt alot diff. But it was a shit load louder and raspier though too
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