I've got a no-name cannon that was on special at repco.
I didn't mean to buy it, it came with the (second hand) full exhaust I bought, i didn't get it from repco, think it was $100 originally? which is what i paid for the full exhaust, including the muffler, second hand.
Its a bit loud. don't think it has much resistence either (its loud enough to think it wasn't there)
If you get a second hand exhaust, watch out for rust, the extractors and most of the exhaust had to be thrown away after they tried welding it in at carline.
The extractors weren't even flush with the block, they tried to fill in the gap. it lasted about 30 k's.
It was up the shit. WATCH OUT FOR SECOND HAND EXHAUSTS!!! rusted through, was pretty old.
I recommend getting an exhaust done if you're going to get a muffler, but its your car, why weld a cannon onto a smaller pipe if you can get it welded onto an upgraded exhaust?
you can get them new pretty cheap, i think my extractors is called "wildcat" which is standard shit they put on all 4K's, but again, I was desperate and just wanted some extractors, and heard rob bliss are good, have a few mates who were happy with them.
I got my exhaust (fixed) by rob bliss because i was in a hurry, they seemed to get it done good, but there's already surface rust on the extractors?! which worries me a bit because of what happeend to the old one... might have done with a good paint first?
i only fixed my exhaust cos it was broken. if you can take the time to do it yourself, who knows.
anyway you only asked about the muffler...