Bleh true duals
. I run a Y pipe into a single SSS Adrenaline muffler right now. I needed something and it was at the shop, free. Had it from a damaged system off a Mustang I repaired. I'm uploading a clip, took it today. Was the last time my truck will run until the SAS is complete. I've also got one of an open system, Y pipe only. My favorite SOUND is an H pipe into a pair of single chamber Flows. The most power you will make will be an X pipe into your good flowing muffler of choice. If you live somewhere that emissions aren't important then ditch the cat. If you need it try to find a higher flowing unit. Not that it makes more noticeable power but it will really help the sound.
This is no cat or muffler, Y pipe only.
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The one of the SSS muffler is uploading, I'll add it when finished.