I have done search but not satisfied yet and my case is a little different. I have 2 seater NA with no cat, straight through resonator and 2.5 inch catback with the matching straight through mufflers (apexi N1 style). I've been driving it for a year or so and now I just want something quieter. Should I change the muffler into the dual tipped version or should I add another resonator in the system (dual exhaust system as per original of course)
Do the environment a favour and fit some cats........... plus it will have the added benefits of quietening your exhaust a bit and avoiding the $5,000 fine for not having cats.
He is in New Zealand I think where its perfectly legal not to have cats on the car. :wacko: :sick: But yeah, fit some cats on, you wont be losing power and torque through it and if you did, it would be negligible (only a few kw difference on some big power TT's with a good exhaust system) The dual tip mufflers should also help. I had a straight through 2.5" all the way exhaust with 2 dual mufflers and the x-pipe and sounded awesome and not overly loud at al
Does anyone even know of anyone getting a fine that high for no cats? The worst I have seen for having no cats is a canary and a tiny fine of like $200 or something. I have seen the above many many times but am still yet to see or hear of someone getting the 'up to $10,000' or whatever it states in the act.
I read a post on SAU (skylines australia) where one guy got pulled over in Melb on his way home, and they fined him $2000 on the spot for not having any CATS on his car. $10K seems a little high, but still, I'd prefer to spend the $2K else where. Cheers
I was successful in doing this by installing an extra cross-pipe between the two sides of the system.
Type of resonators I've just been through something similar - my new exhaust was too loud. As Dub said, an x-pipe will help but the right resonators will also make a big difference. On mine, they started with a set of straight-through 'hotdog' style resonators but changed them to 'offset' resonators. These are used on the Commodore or Falcon (I think). They're a big, flat, oval shape and only just fit behind the cats (but you don't have any so the space will be less of a problem). They are straight through but contain a lot of steel wool and work quite well. I've also seen a Z with a huge, dual in/dual out resonator located where the cats would go. That seemed to quieten things down a lot as well. See Ya, Garry
I had a custom-built 2-in/2-out resonator with an expansion chamber in the middle fitted to my Zed for about AUD100. The central chamber has the same effect as an x- or h-pipe. Seems to work well. Cheers, Doug.
