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 Post subject: new exhaust
Posted: Thu Apr 21, 2011 2:05 pm 
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ok so im under my car unbolting my tailshaft an i noice a 12-14'' slash in my middle muffler
thinking about making a new exhaust cat back
is there anything i need to consider ..
thinking about 2 1/5'' strait thru
do i need any mufflers or can i just go straight
apart from a defect do i need a cat or will loosing it hurt performance
wats the deal with back pressure how much do i need was the best way to obtain it
i have a pipe bender and i can get exhaust pipe new...
cheerz

 

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 Post subject: Re: new exhaust
Posted: Thu Apr 21, 2011 4:42 pm 
Getting Side Ways
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sensibly and legally you need a muffler, but there is a guy up here in Syd who has a EB/ED with no muffler he likes it but we call it the tractor - draw your own conclusion there! not good!

 

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 Post subject: Re: new exhaust
Posted: Thu Apr 21, 2011 4:51 pm 
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yeah your going to need a muffler, run the car straight from the extractors and you will hear it will sound like a tractor.... you can pick up some good 2.5" systems on ebay...

 

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 Post subject: Re: new exhaust
Posted: Thu Apr 21, 2011 4:55 pm 
Getting Side Ways
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yeah those redback ones aren't bad for the money really. for example :-
http://cgi.ebay.com.au/REDBACK-2-5-SPOR ... 27b43a6983

 

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 Post subject: Re: new exhaust
Posted: Thu Apr 21, 2011 5:50 pm 
Parts Gopher
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wat is a muffler worth ...
i can bend and weld the rest also can i buy flanges
or should i make them...

 

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 Post subject: Re: new exhaust
Posted: Thu Apr 21, 2011 6:01 pm 
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http://cgi.ebay.com.au/Redback-Megaflow ... Car_Parts_

 

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 Post subject: Re: new exhaust
Posted: Thu Apr 21, 2011 6:14 pm 
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Look at Hooker Aerochamber mufflers, I bought mine off ebay for about $130.

If you can weld/have access to a welder you will be able to make something better than what you will buy off the shelf for the same $$$. In the end the only difference you will probably notice is the note though.

 

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 Post subject: Re: new exhaust
Posted: Thu Apr 21, 2011 8:05 pm 
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you can buy flanges cheaper than you can make them unless you have alot of time on your hands i've found...

you definitely need a cat and at least one muffler, they also assist back pressure.

2.5 or 3 inch is constantly argued on this site and plenty of relevant information and opinions around about it. General consensus seems to be that without outrageous mods, 2.5 inch is fine.

 

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 Post subject: Re: new exhaust
Posted: Thu Apr 21, 2011 9:51 pm 
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i can weld i ave a welder and a pipe bender
were can i get flanges from in sa ....
how do i get the right backpressure....

 

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 Post subject: Re: new exhaust
Posted: Thu Apr 21, 2011 10:00 pm 
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I had a bloke who worked in a jap performance shop laugh at me wen I told him I bought a 2.5 inch cat back, he said it was too big for a stock 4l but I put it on and it seemed to make a difference, but it is droney with 1 muffler and no resonator, alot of people will debate over what size and how many mufflers you need, id say do wat you want all we can do is give advise

 

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 Post subject: Re: new exhaust
Posted: Thu Apr 21, 2011 10:03 pm 
Getting Side Ways
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Can you bend exhaust tube with a pipe bender without it kinking?
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 Post subject: Re: new exhaust
Posted: Thu Apr 21, 2011 10:06 pm 
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I couldn't agree more.

I have 2.5 on my ute, dumped at the diff with one muffler and one hot dog with stock cat and it's loud, it can get droany and lacks back pressure.... but I like it lol

 

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 Post subject: Re: new exhaust
Posted: Thu Apr 21, 2011 10:09 pm 
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get pinned for no cat and your down $15000, yep $ 1 5 , 0 0 0. thats the EPA fine. its mandated not a maximum fine, thats what it is.

Its not worth not running a cat.

 

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 Post subject: Re: new exhaust
Posted: Thu Apr 21, 2011 10:18 pm 
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not in the land of the long white cloud is it ?

have been there done that, only difference not running a cat is the smell makes you want to vomit. performance is unchanged droan is increased. Best off keeping the cat.

 

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 Post subject: Re: new exhaust
Posted: Thu Apr 21, 2011 11:36 pm 
Parts Gopher
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ok then 15000 wow .. ill sick to my cat..
i could even justify spending 1000$ on a cat....
umm i think you can bend it with sand in the pipe or heat
but i dunno im not a a pipe bender im a welder

 

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