What are your goals? Are you trying to make it a bit louder then stock and/or a bit of a improvement in performance? I don't know, what your budget is; you might check with some local muffler shops, see what they charge to make one for you and add a free flowing muffler, like a flowmaster, etc.
Otherwise, if you need a full cat back exhaust; you might check some of the oem muffler/exhaust systems from Bosal and then, others, like Magnaflow, Borla, TechTonicsTuning, Megan Racing, etc.
This Megan Racing system; looks like a affordable option on sale:
Megan Racing MR-CBS-VWG99 Cat Back System - NA-Type
thmotorsports.com
If the upgraded exhaust sound; is a issue, you might watch some of the exhaust sound videos on youtube:
If you bought a premade replacement exhaust; you could replace it yourself, that might save you some money on installation, at a muffler shop?