Header Difference

I can't say one street header type is better than the other, that would be just useless opinion. Rather with either of the basic street type using data in the OP in this thread I can definitely point to one design specification as a better fit for purpose based on stock LS3 performance specification data (5700 RPM peak HP).
Info in that post provides complete details to achieve certain results on our LS3 in a street car with mufflers and a tailpipe:
• Low to Mid-Range RPM Torque and HP (4-2-1 or 4-1)
• Low to Mid-Range Torque and Hi RPM HP (4-2-1 or 4-1)
• Mid-Range TQ to Higher RPM Horsepower (4-1)
• Higher RPM Horsepower, possible TQ loss (4-2-1 or 4-1)

Haha very close
FWIW I don't race around and make noise, love the low down torque, so if I had a near stock LS3 the perfect full system would be:

Headers

Type: 180º reflected pressure wave headers, coated
Initial Dia: 1 3/4" at block
Primary Length: 32" long
Final Accelerator: 2.25" at merge​

Collector

Type: Divergent Megaphone
Length: 19" from merge
Final Dia.: 3"
Volume: >47 cubic inch before cat substrate​

Cats

Type: 3" 200 cpi Steel Barrel
In/Out: 2.5", integral to collector (riser sawn-off)​

Mid-Pipe

Type: 2.5" stainless​

Balancer

Type: 2.5" pressed clamshell X
Location: Second Harmonic, 74" from end of primaries​

Axle-Back

Type: 2.25" stainless
Resonators: 9" hot dogs​

Mufflers

Bi-modals or
Sports muffler with helmholtz piping​

 

Thanks mate, very informative videos.


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Yep @426Cuda you are quite eloquent and well spoken for a country fella

 

Well where the fook can we get these 180 headers? I NEED that sound!

 

This is how 180° headers sound tuned to an LS3, in our car:

Designed for our car daily Street duty, Low to Mid-Range Torque and Hi RPM HP on petrol at 6200 RPM peak. All systems made to order.
Headers, wideband sensors, harness, megaphones, cats, x-pipe and full custom road tune as a tunkey solution for $4k fitted.

 

Is that the voice of the mysterious creature referred to as cuda, known to frequent the area around Wagga Wagga?

 

Umm, thanks Monstar, I think? Taking the Akubra off helps attenuate the bush twang. Lol.
Anyway, hopefully it's of some assistance to anyone looking to do this upgrade. Your vids and pics certainly helped me at the time.

 

Nah mate, that was a stand in. Gotta keep the mystery alive.

 

Great vids thanks cuda! Perfect sound in my opinion and just what im after

 

wow that sounds great. what set up is this? i have a magnum on order and drove my 1st v8 ute this weekend (maloo with 340kw) and both wife and i now cant wait for delivery. pretty committed to a ful exhaust,cai and a tune straight away.

 

Cant wait for that vuy to fit it to his motorsport and have a listen. Was he using hsv cats or different brand? If differentvwhat brand were they?

 

That is the Crossbones 180° reflected headers with megaphones, cats, x-pipe with 2.5" catback, HSV bi-modals. It is an advanced exhaust system, not for the feint hearted.
Installed and engine tuned correctly, the ignition firing order remains same however exhaust pulses are re-ordered by crossing over pipes from one bank to the other so as to order exhaust pulses sequentially. In simple terms this turns an exhaust pipe into a siphon that draws in fresh charge from the intake during valve overlap in a process called inertial supercharging.
Same primary efficiency advantage as a flat plane crank (Ferrari, GT350) without the bolt-snapping secondary vibrations. In other words although it may sound better the primary purpose of its engineering is better performance throughout the LS3 operating range.

 

AKA 'sonic ramcharging'.

 

so after reading all these posts, went out to the garage and got out my HSV exhaust that I bought to put on my Redline which never happened as I bought a Motorsport so waiting for that to arrive and fit it on. I bought 340kW GenF2 Clubsport headers and cats. The diam at the end of the cats is 2.5" and the diam of the holes for the heads where they bolt up the exhaust on the manifold measure outside diam 2.5" the inside of the headers is 2".

I then bought a centre section off a GenF2 GTS and the pipes are 2.5" in diam and on one end I have a flat flange and the other end if just a round fitting with a clamp.

 

which thread was it that someone posted a photo of the Holden LS3 and the HSV LS3 exhaust systems together? Cant find the photo now.

 

Thanks for the detailed videos cuda car sounds great.

Mike

 

The plot thickens......