Installed Cup pipe and ...
Thread Starter
Rennlist Member
Joined: Nov 2013
Posts: 436
Likes: 205
From: Charlotte, NC
Installed Cup pipe and ...
Installed a cup pipe, sport cat and SW chip recently. While at VIR, I started to hear a rattle in my secondary muffler. Upon my return I took the muffler off and there is a huge split on the inside middle of the muffler, the side away from the wheel. While I can't say it was caused by the change in exhaust, I remember hearing others had something like this happen. I took the muffler to a repair shop and they said it couldn't be repaired due to the metal being too thin.
So I am now wondering what my next step is....thoughts?
So I am now wondering what my next step is....thoughts?
Pro
Joined: Dec 2004
Posts: 535
Likes: 0
From: Long Island N.Y
The outcome that you experienced unfortunately is typical of changing out the OEM muffler for the cup pipe for a car that is tracked. The suitcase muffler cannot withstand the additional exhaust pressure. Use the sport bypass cat, replace the cup pipe with OEM and use a Dansk G pipe to replace the split secondary muffler. This combination worked out very well on my former De/Street 964.
Dan
Dan
Thread Starter
Rennlist Member
Joined: Nov 2013
Posts: 436
Likes: 205
From: Charlotte, NC
I actually installed the g pipe first but didn't like the "V8" sound so went the cup pipe route and love the way it sounds. I couldn't tell any performance difference but that was seat of pants not dyno testing.
Thanks for the replies - I will search for a good used one to replace the one I have as the split is in two directions.
Thanks for the replies - I will search for a good used one to replace the one I have as the split is in two directions.
Rennlist Member
Joined: Jan 2007
Posts: 2,388
Likes: 17
From: Vancouver Island, BC , Canada
Any good qualified welder can weld the muffler, muffler shop welders do not nessecarily come into that category. Take it to a proper welding shop and have them weld it up and also reinforce it with a plate covering the welded area.
Three Wheelin'
Joined: Mar 2010
Posts: 1,400
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From: McKinney, Texas
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Thread Starter
Rennlist Member
Joined: Nov 2013
Posts: 436
Likes: 205
From: Charlotte, NC
As an update, I ended up replacing the secondary muffler with a used one sourced from a rennlister as my muffler was split in three places. Upon replacing, I noticed the heat shield next to the muffler was destroyed as it seems the heat emanating from the split in my old secondary muffler was enough to damage it. Upon further inspection, the ignition wires behind the heat shield were beginning to melt....looks like a good excuse for an upgrade. Any suggestions?
Technical Guru
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From: USVI
Instructor
Joined: Feb 2014
Posts: 140
Likes: 18
From: Sydney, Australia
964-Secondary-Muffler-Blown_zpsttnbyokr.jpg
Not uncommon when running a cup pipe (which I've been running since purchase, installed by previous owner). On the plus side this opens up some exhaust options
:I'm looking at options one of which is to replace the secondary, but only if it's been updated? Mine is part number 964.111.046.04 dated 02/90 and I think the current one is .05, so presumably updated to prevent this happening again?
Three Wheelin'
Joined: May 2012
Posts: 1,349
Likes: 4
From: NYC
If you are looking for a OEM fitment solution to the secondary, there is this; its pricy though.
http://www.rstube.co.uk/exhaust.php?idproduit=289
http://www.rstube.co.uk/exhaust.php?idproduit=289
Instructor
Joined: Feb 2014
Posts: 140
Likes: 18
From: Sydney, Australia
If you are looking for a OEM fitment solution to the secondary, there is this; its pricy though.
http://www.rstube.co.uk/exhaust.php?idproduit=289
http://www.rstube.co.uk/exhaust.php?idproduit=289