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I need exhaust helf single or dual? 

 

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 Post subject: I need exhaust helf single or dual?
Posted: Fri Jul 12, 2013 9:41 pm 
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Hi everyone

I have an ef xr8 and am looking at getting a cat back exhaust. I'm only after a tough note, not chasing power hence why i'm not doing extractors etc. I've been told by one shop do go the single which is about 400 and another shop said go the twin system.

What system sounds good? Does anyone have any video they can upload of either system so i can hear the sound they produce?

Thanks
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 Post subject: Re: I need exhaust helf single or dual?
Posted: Fri Jul 12, 2013 11:08 pm 
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Probably comes down to what type of mufflers are fitted to either of them.
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 Post subject: Re: I need exhaust helf single or dual?
Posted: Sat Jul 13, 2013 9:57 am 
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my V8 LTD DF had extractors, twin hi flow cats to a single 2.5" system with 1 muffler. It had a tough idle and got loud when you got on the go pedal

 

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 Post subject: Re: I need exhaust helf single or dual?
Posted: Sat Jul 13, 2013 6:00 pm 
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For a V8 a twin system is a must IMO.

Two straight through mufflers before the diff, and two hotdogs in the tail section. It's a tight fit over the diff and round the spare tyre, but worth the effort and $$ I think.

 

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 Post subject: Re: I need exhaust helf single or dual?
Posted: Sat Jul 13, 2013 6:02 pm 
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the dude that bought my LTD put a twin 2.25" exhaust on it, and had issues with a drove. When I bought the LTD I thought the exhaust was stock, and on the way to buying it I was like "gunna put a twin exhaust on it etc" Then rocked up and he started it up, and I was like nope, it sounds fine

 

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 Post subject: Re: I need exhaust helf single or dual?
Posted: Sat Jul 13, 2013 8:05 pm 
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Did the system have a H-pipe or X-pipe in it?
It would drone without one.

 

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 Post subject: Re: I need exhaust helf single or dual?
Posted: Sat Jul 13, 2013 8:13 pm 
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originally no. But different setups were tried and it ended up costing him a bit. Hence why I left it because I knew if I changed it, s**t like that would happen

 

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Daily driver: AU2. 5 speed. 19" FG luxos. Full exhaust. Lowered. AU3 XR leather interior, converted to full power windows. 3.45 LSD. IN THE FUTURE: Tickford 6
Weekend driver: EA SVO AU motor. Built BTR. TCE 2800 stall. T76 turbo. Locked diff. On E85. approx 320rwkw. 11.5 @121mph

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 Post subject: Re: I need exhaust helf single or dual?
Posted: Mon Jul 15, 2013 11:09 pm 
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I'm that dude. Yes, it has been a bit of a battle and I want to have another crack at it.

I have a dual 2.25" with a crossover (that I didn't really want), a single dual-in dual-out muffler under the floor and 2.25" hot dogs just before the bumper. It sounds alright but it's not quite old-school enough for me - while it's pretty deep, it's too "smooth" and modern. I want some more chug like my Clevo had.

A word of warning - there is depressingly little room under these cars for a proper exhaust. Some people manage to fit nice big systems with Aerochambers but I don't know how.

I'm with MAD - V8s NEED dual systems. Apparently 304s sound good with singles but I don't believe in them on real cars (Holden dig!). Building a system for the LTD has indeed been problematic. I'm not cashed up enough to start again but I'm seriously considering replacing the dual-in dual-out centre muffler with a pair of hot dogs as this has worked quite well for a friend with an EB XR8. He has a dual 2" with two hot dogs per side and no merge and it sounds pretty tasty!

MAD, you're both right and wrong. This particular system does want to drone and I believe it's because of the muffler - if it had two seperate ones not one with two pipes in it I'm damn sure it wouldn't drone. Merges, X-pipes or balance pipes are not necessary in every system and I don't like them - my ZJ was un-merged and it couldn't have been further from droney. To each their own.
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 Post subject: Re: I need exhaust helf single or dual?
Posted: Tue Jul 16, 2013 1:04 am 
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I currently have a Twin 2.25" into a single 3". No drone, sounds good. I'll be making Move to a Twin 2.25 all the way through with an X pipe and Hooker Aerochambers. But, mine isn't exactly your stock EB. AU 220KW spec with a T3 cam and ported Explorer manifold.

 

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 Post subject: Re: I need exhaust helf single or dual?
Posted: Tue Jul 16, 2013 8:01 am 
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eh. The LTD sounded fine, and turns out that just before I bought it, it had a EPA warning issued on it.

My brother had a VP Calais with a 5L and a decent cam and stall with a twin 2.5" with no cross pipes. Sounded really good.

 

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Daily driver: AU2. 5 speed. 19" FG luxos. Full exhaust. Lowered. AU3 XR leather interior, converted to full power windows. 3.45 LSD. IN THE FUTURE: Tickford 6
Weekend driver: EA SVO AU motor. Built BTR. TCE 2800 stall. T76 turbo. Locked diff. On E85. approx 320rwkw. 11.5 @121mph

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 Post subject: Re: I need exhaust helf single or dual?
Posted: Tue Jul 16, 2013 10:43 am 
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I meant that the setup I'll be moving to well be too big for a stocker. X Pipes are there for power and torque, not noise. Although they do hello eliminate the thong slap some cars get

 

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 Post subject: Re: I need exhaust helf single or dual?
Posted: Tue Jul 16, 2013 10:48 pm 
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X pipes are used to quieten a system that is too large for the engine and they remove wonderful things like the Clevo howl - don't fit the X pipe, it'll sound more like a real V8 and less like a smooth boring Euro.

Your brother's Calais would have sounded great with that system.
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 Post subject: Re: I need exhaust helf single or dual?
Posted: Tue Jul 16, 2013 10:58 pm 
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El Tazo wrote:
X pipes are used to quieten a system that is too large for the engine and they remove wonderful things like the Clevo howl - don't fit the X pipe, it'll sound more like a real V8 and less like a smooth boring Euro.

Your brother's Calais would have sounded great with that system.


NO! An X pipe is used to promote cylinder scavenging, increasing torque and power.

 

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51TER - DL LTD. Stock.

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 Post subject: Re: I need exhaust helf single or dual?
Posted: Wed Jul 17, 2013 8:06 am 
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El Tazo wrote:
X pipes are used to quieten a system that is too large for the engine and they remove wonderful things like the Clevo howl - don't fit the X pipe, it'll sound more like a real V8 and less like a smooth boring Euro.

Your brother's Calais would have sounded great with that system.


It did actually. Didn't sound like a boat like most standard Holden 5L do with an exhaust

 

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Daily driver: AU2. 5 speed. 19" FG luxos. Full exhaust. Lowered. AU3 XR leather interior, converted to full power windows. 3.45 LSD. IN THE FUTURE: Tickford 6
Weekend driver: EA SVO AU motor. Built BTR. TCE 2800 stall. T76 turbo. Locked diff. On E85. approx 320rwkw. 11.5 @121mph

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 Post subject: Re: I need exhaust helf single or dual?
Posted: Wed Jul 17, 2013 12:28 pm 
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El Tazo wrote:
X pipes are used to quieten a system that is too large for the engine and they remove wonderful things like the Clevo howl - don't fit the X pipe, it'll sound more like a real V8 and less like a smooth boring Euro.

Your brother's Calais would have sounded great with that system.



No, that's not correct. X-pipes balance pulses, increase power/torque and they also help promote noise.

I have a Magnaflow Tru-X, not one of those crossovers that is just two bent pipes joined in the middle. It creates a very nice crackle as the revs increase.

With that I have two 6" Magnapacks, one on either side before the diff. It sounds damn tough!

 

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