I'm looking at the RS-R exmag exhaust because I want something quiet and performs well.

However, in the future I might go turbo with 10 PSI. Would a 60mm exhaust trim be a HUGE bottleneck? I mean really, how much whp would I lose? Anything significant?

 

i remember reading like a week ago this guy on here saying that he made like a little over 300 hp with the exmag. i wonder if the mugen twin loop would be a better choice. Cause i see the exmag as a chambered muffler and twinloop just loops twice (but is free flowing)

 

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I have the apexi ws2 and it's the same diameter. I'll be running that exhaust with a qtp electonic cutout and tune it with open downpipe. the setup will be a 50 trim b18b. I think an e-cutout will probably be your best bet.