just fitted a berkley system to our AU, it came with a resonator and a muffler. after a week of head ache inducing drone i bought another muffler to fit to it.
It droned horridly while accelorating at 1800 to 2100rpm, it also droned while cruising a 60km/h.
I was not impressed with it at all.

I have a 95 EF Falcon GLi and before last weekend i had a 2.5 inch cat back exhaust system on my car and it sounded FULLY SICK MATE! And now I just got a brand new set of Pacemaker competition extractors and a magnaflow high flow cat fitted on my car. I've noticed a power increase and it definitely makes it sound meaner at idle, but i'm not really liking the new exhaust note it makes at around 1400 revs. It kinda sounds like a ricer or something. But anywhere after that, it sounds awesomeness. My mate reckons that because i got brand new parts, it may take a bit of wearing them in before it will go away and sound better. What do you guys think?