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I had a custom (quiet) full system on my valver when I bought it but the tailpipe stuck out quite far. I've recently replaced the backbox with a Powerflow custom and its awesome. I know Powerflow seems to get mixed reviews on here but mine sounds so gd imo. It sounds nice from 3k then by 5k above it gets raspy. It pops and bangs on overun and is what I wanted. I;d say if ya did get a custom one be sure what you want it to sound like before hand and make it clear to the people doing the work.
I've got a magnex and have been very pleased with it. Nice and deep but not excessively noisy, releases a fair wedge of power it seems, plus it quietens down nicely when you reach decent motorway cruising speed (95ish )