Considering replacing H pipe on NISMO exhaust

MigMac

Thanks for the measurements. I am sure the stock system is all sized out in metric measurements. I am checking with a guy this week or next about creating an X pipe using a Magnaflow x pipe section. I am just debating whether to make the section 2.25" or 2.5". I don't want to slow the exhaust gas down too much going to 2.5" x pipe and ruin the scavenging effect, nor do I want to choke the system down going to 2.25". Too many decisions!