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post #1 of 13 (permalink) Old 06-13-03, 06:24 AM Thread Starter
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confused Exhaust mods- need help

got the rear ressy removed from my ute on tuesday..

not happy at all.

sounds good when idiling..
but

going through about 18L avg per 100km
feels alot less responsive
and feels like its lost a shyt load of power!


im going into herrods on monday to get a proper one fitted..

whats better in the cat back system....
stainless steel- i think its a 2.5" duel into 3" over the axel and then into 2.5" again..

or

Mild Steel 3" all the way..

opinions?

also, cant afford the whole system yet so i was thinking maybe to get the Hi-Flow cats put in at the same time, and in a few weeks time, i'll get the herrod extractors..

Thanks

Teza


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post #2 of 13 (permalink) Old 06-13-03, 06:42 AM
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i would go the twin 2.5' into a 3' single,should work ok.....
and if its anything like the gt-p that got a zorst done there,youll be absolutely rapt with the sound!





cheers,phil.

Terrorising a crap driver near you!
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post #3 of 13 (permalink) Old 06-13-03, 06:49 AM
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Mate id go for a twin 2.5 and then just before the axle id go into a single 3" run one big cat a fair way away from the engine bay. Thats exactly what im doing with the supra.
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post #4 of 13 (permalink) Old 06-13-03, 09:38 AM
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have ya checked if ya cats alright?
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post #5 of 13 (permalink) Old 06-13-03, 04:54 PM
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Heard a 2 1/2 into 3' on a 308, sounds bloody mint. Not hell loud, but plenty of note....

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post #6 of 13 (permalink) Old 06-13-03, 05:14 PM
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Have to agree with above

What are you after sound?
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post #7 of 13 (permalink) Old 06-13-03, 10:12 PM
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Wink

302_Supra,

I think your cat won't work because it needs to be close to the headers to build enough heat to do its job. If you locate it too far downstream the gases will have cooled enough so the cat will be ineffective. 'Course if thats what you want...
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post #8 of 13 (permalink) Old 06-14-03, 12:57 AM
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as long as EPA see a cat it should be ok...I asked around as i jus got my exhaust done (debating over twin cats or single) and dont think there is a required distance from headers to cat....whether or not the cat will do its job effectively (if at all) that far back is another question though....
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post #9 of 13 (permalink) Old 06-14-03, 02:06 AM
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yeah i sorta figured that :) Ill wait and see...havent even got the headers made yet...but i have a plan on paper!!!
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post #10 of 13 (permalink) Old 06-14-03, 02:15 AM
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My brother has 2.5 twins to a 3 and it sounds like shite. Had different mufflers in there but still sounds shite, maybe
try 2.5 twins with hotdogs and balance pipes, give it a bit of note!
Out of the options i would go 3 all the way, rather 2.5 twin into 3 back into 2.5
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