I have a HQ ute that I am slowly making into a Sandman replica. I went to the local exhaust shop and enquired about a price for a twin exhaust to slot into my 253 I'm about to put in around 6 weeks time. They said it was going to cost me about $700 installed.

Basically they said they would pre-order a set up for a HQ sedan and then modify it to make it fit. Anyway it was a twin muffler with twin exhaust.

While we are on the subject, what is the advantages from a single to a twin?

Is it better on fuel or more power etc?