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2.5" twin or 3" exhaust? 

 

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 Post subject: 2.5" twin or 3" exhaust?
Posted: Fri Jul 14, 2006 11:40 pm 
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hey everyone,

i have a ba 5.4l ute and want to get a cat back exhaust, already have a xr8 one on there but it doesnt sound like an 8 :? anyways just wondering whats the way to go? my mates got a 3" difilipo and it sounds pretty good but ppl have been telling me twin 2.5s the go. is there much of a difference and what brands would ppl suggest?

thanks, mark

 

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Posted: Fri Jul 14, 2006 11:48 pm 
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u want sound like an 8, go twins, and add a X pipe (cross pipe) for that real older v8 sound, awesome stuff..

 

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Posted: Sat Jul 15, 2006 12:01 am 
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Twin 2 1/2 with X pipe and 3" tail pipe to make V8 sound like one...

 

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Posted: Sat Jul 15, 2006 12:40 pm 
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where's a good place in melb to get one?

 

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Posted: Sat Jul 15, 2006 12:47 pm 
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Talk to Craig at Aussie Car Enhancements in Melton, http://www.aussiecar.com

I think he uses Di Filipo gear? He has the quickest 3V street car in the country 12.71 @ 108mph, and one of his customers ran a 13.0 last night in their 3V XT Falcon.

He can help you make it sound good AND run hard :)
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Posted: Mon Jul 17, 2006 7:55 pm 
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someone suggested i get 2 hotdogs put in where the rear muffler is, any thoughts on that?

 

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Posted: Mon Jul 17, 2006 8:42 pm 
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my mate has twin 2 1/2" running seperate down the one side. no mufflers just hotdogs before the diff. sounds bloody awesome. real tough rumble..

 

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Posted: Mon Jul 17, 2006 9:30 pm 
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ye i've been told it sounds good and someone suggested i keep my exhaust and change the middle muffler with hotdogs and take the resonator off. dont know if its worth doing something like that or just get a new exhaust :/

 

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Posted: Mon Jul 17, 2006 9:37 pm 
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yer tht would sound ok.. i dont think theres anything wrong with the ford exhaust, its just the muffler and rear resi tht restrict the note u want..

 

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Posted: Mon Jul 17, 2006 9:53 pm 
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I have two magna flow "hotdogs" into single inlet dual outlet magna flow muffler at rear. Sounds excellent without any droning. Twin mufflers at back would sound tuff , interested to know if it would drone tho.
this is on a 5lr au with work done.

 

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Posted: Mon Jul 17, 2006 9:57 pm 
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I have two magna flow "hotdogs" into single inlet dual outlet magna flow muffler at rear. Sounds excellent without any droning. Twin mufflers at back would sound tuff , interested to know if it would drone tho.
this is on a 5lr au with work done.

 

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Posted: Mon Jul 17, 2006 11:19 pm 
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anyone recommend a good place in melb? pref northern subs

 

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Posted: Sat Jul 22, 2006 11:19 am 
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[quote="punktured"]someone suggested i get 2 hotdogs put in where the rear muffler is, any thoughts on that?[/quote]

I hava a custom 3" system with modified headers/collectors running down centre of underbody dumping before the diff using two canons.

Does it sound tough? YES

Does it drone? HELL YES

was there a noticeable hp increase? YES and this was my aim so am very happy with the outcome.

my 2c
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Posted: Sat Jul 22, 2006 11:38 am 
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Not entirely sure where I read this, but I believe it was in zoom.
Dual 2.5" pipes flow the equivilant of a single 3.5" pipe.
To check this, simply check the cross sectional area of the pipe.

 

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Posted: Sat Jul 22, 2006 11:56 am 
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Dual 3" by the way,

Quote"Dual 2.5" pipes flow the equivilant of a single 3.5" pipe."

I dont understand how twin 2.5 = approx 5" diameter in total as opposed to 3.5" approx in total diameter can give the same flow. Im no exhaust flow guru but thats 1.5" difference that supposibly makes no improvement
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