+1. Worth every penny, ....and Berks HFC's while you're at it.
+1
Think tarmacsports has them for 850 pounds if im not wrong, its a true dual system, well worth it, sounds awesome to, no rasp rather like deep and good sound, and not to loud, think with good restineted hfc or test pipes its around 94-95dB, less with OEM cats
http://www.tarmacsportz.co.uk/GB/Invidia_350Z_GEMINI_ROLLED_TITANIUM_TIPS_CAT-BACK/HS02N3ZGID_.aspx
You can also get them with stainless steel tips.
I have stainless steel in stock, also for the month of Jan they have 5% off which is a steal, I would be quick though as a lot of the suppliers have started putting prices up already