Single tip is when the rear silencer only has one outlet pipe, but you can make a single outlet pipe look like a dual pipe by fitting a Y-Tip piece
On the 330 I am sure that you have two seperate outlet pipes coming from the rear silencer, so two individual single pieces will be what is required
for two single tips to be fitted it would be around R800 maximum, depending on the style and size that you choose (all included)
For smaller diameter exhaust tips we can drop the total price for two individual tips to R700 (neg)