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CC Advertisers
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09-01-2014, 08:38 PM
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CC Member
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Join Date: Nov 2009
Location: Cheltenham,
Vic
Cobra Make, Engine: Classic Revival CR3516, LS3, Aussie Mike'd T-56, 3.70 LSD, AP brakes, Penske shocks
Posts: 1,616
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Not Ranked
Sidepipe max pipe diameter
I am presently working on my exhaust, currently the headers, and planning to make my own sidepipes. Talking live pipes here, are most people's pipes 4" in diameter (max)?
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BUILD-BLOG: http://cobrablog.holnet.net
Ben in AU
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09-01-2014, 09:37 PM
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CC Member
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Join Date: Jan 2001
Location: Sunbury,
VIC
Cobra Make, Engine: Rat Rod Racer, LS1 & T56
Posts: 5,391
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Not Ranked
Mine are 4.5" diameter for the muffler body and 3.5" diameter for the collector and tip. The cats I use are a 4" diameter body and won't fit inside a 4" pipe.
Cheers
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Mike Murphy
Melbourne Australia
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09-01-2014, 11:51 PM
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CC Member
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Join Date: Sep 2004
Location: Canberra,
ACT
Cobra Make, Engine: G-Force Cobra '68 302, T-5, Jag 3.77 LSD.
Posts: 993
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Not Ranked
I think the factory Robnell 429's use 5". They are quite large but don't really look out of place.
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SLIPRY
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09-02-2014, 02:58 AM
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CC Member
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Join Date: Sep 2010
Location: redcliffe,
qld
Cobra Make, Engine: venom motorsports /ls1 auto
Posts: 500
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Not Ranked
I have got 4" ffr pipes but I reversed the internal muffles /resonators so as to meet the dbrnoise test & put my cats 4'' just inside the guard with the o2 sensor just before the cats meet all tests
pm me you email address & ill send you all the pics as im having trouble post to the site
rob
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not all your babies are your children
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09-02-2014, 03:20 AM
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CC Member
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Join Date: Nov 1999
Location: Brisbane, Australia,
Q
Cobra Make, Engine: Contemporary CCX3117 427FE
Posts: 4,381
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Not Ranked
I had a 3" perforated inner pipe and a 5" outer on the old blue car. Allowed it to breathe well and with a full inch of packing around the perf pipe gave it a pretty mellow exhaust note (at idle anyway).
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Craig
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09-02-2014, 03:32 AM
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CC Member
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Join Date: Sep 2010
Location: redcliffe,
qld
Cobra Make, Engine: venom motorsports /ls1 auto
Posts: 500
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Not Ranked
__________________
not all your babies are your children
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09-02-2014, 08:46 AM
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CC Member
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Join Date: Feb 2014
Location: White City,
SK
Cobra Make, Engine: West Coast, 460 CID
Posts: 2,861
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Not Ranked
I have 3.5" pipes with a pair of Patriot augers ( http://www.summitracing.com/int/part...3843/overview/) in each pipe behind my 460. Noticeable tone at idle, a bit of a bark when hard on it, but mellow out nicely at steady speed.
BTW, Patriot also has 20" & 26" side pipe turnouts in unfinished, black paint, chrome or ceramic coated, with or without louvered inserts.
Patriot inserts are available in 3" & 3.5", if you're looking for 4" (at a much higher price), check out http://www.spiralturbobaffles.com/
Last edited by cycleguy55; 09-02-2014 at 09:27 AM..
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09-06-2014, 08:17 AM
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CC Member
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Join Date: Feb 2014
Location: White City,
SK
Cobra Make, Engine: West Coast, 460 CID
Posts: 2,861
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Not Ranked
One thing I've learned about the augers - if you can push them in by hand they're too loose. Mine were and the rattling drove me crazy so I pulled them out, bent the spirals to be a tighter fit and drive them in with a 24 oz. ball-peen hammer. Nice tight fit, no rattles and they even sound better.
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