I have never seen or heard of a -4 Borla Exhuast. Check out this one for sale on ebay.

http://cgi.ebay.com/ebaymotors/PORSCHE-914...CMake%3APorsche

Nice exhaust- borla only made a limited number of these, then discontinued it, this may be one of the last one. one of the members here- Al Garcia has it - really sounds great, but $800 bucks!? should last for a very long time being stainless. This was just relisted after not getting one bid at $850 for 30 days. (i was hoping he would drop the price further)

PW

I have been running mine for three years. Love it. It looks outstanding, excellent quality. Sound is deep and mellow, not loud and annoying.
Not confermed but was told that they sold originally for $1,100. I paid around $500 as the winner of a NO RESERVE AUCTION.....I was lucky.

Click to view attachment

Very cool, if I didn't have a triad I'd probably be drooling over it.