As Stu says, customs stainless is a good option, bit more 'risky' as you won't know what it sounds like. Some places like Top Gear (not the show lol) listen to what you are after and can come up with something along those lines i.e. throaty / raspy etc.
Other option is to buy a system from Magnaflow, Flowmaster etc. and have someone fit it, that way you can youtube the system to hear what it sounds like. This is definitely the safer option is you've hear a sound that you're after.
I built my stainless system, with crossover pipe and flowmaster delta 50 mufflers and it sounded just like i expected it to, so whilst there is a bit more risk with custom, it can pay off too.
The other option is to just replace the mufflers vs going for a full system. A highflow / sports CAT can often make the biggest difference.
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