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997.1 on a diet

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Old 03-17-2017, 04:21 PM   #31
garyever
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It only took me 5-6 track days after deleting my side mufflers at 23,000 mi. to blow a hole the size of a hardball through the middle section of the front side of my center muffler with numerous cracks extending to within 9" of each end. Stock engine, no ECU tuning, and no backfires other than an occasional throttle lift poping normal to 2007 .1 GT3. The front side looked to be in perfect shape at the time of the side muffler delete. . The extended cracks looked like vibration fatigue working its way from the center to the ends slowly creeping out both directions to destroyi the entire front side panel. Am now welding the cracks and covering everything with a stainless cover plate full length of the front side of the muffler to see if that will serve as a suitable repair and will post an update if it holds up or not.

Anyone contemplating a side muffler delete should consider reinforcing the frontside of the center muffler before deleting the side mufflers.

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Old 03-17-2017, 09:03 PM   #32
CosmosMpower
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Good info, thanks for sharing. I love the sound of my GMG center bypass with stock side mufflers, perfect volume and pitch. I really don't want to deal with finding a stock center section and then re-enforcing it so it doesn't blow up.
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Old 03-17-2017, 09:18 PM   #33
mmuller
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Quote:
Originally Posted by garyever View Post
It only took me 5-6 track days after deleting my side mufflers at 23,000 mi. to blow a hole the size of a hardball through the middle section of the front side of my center muffler with numerous cracks extending to within 9" of each end. Stock engine, no ECU tuning, and no backfires other than an occasional throttle lift poping normal to 2007 .1 GT3. The front side looked to be in perfect shape at the time of the side muffler delete. . The extended cracks looked like vibration fatigue working its way from the center to the ends slowly creeping out both directions to destroyi the entire front side panel. Am now welding the cracks and covering everything with a stainless cover plate full length of the front side of the muffler to see if that will serve as a suitable repair and will post an update if it holds up or not.

Anyone contemplating a side muffler delete should consider reinforcing the frontside of the center muffler before deleting the side mufflers.
I have done this. Twice, on two box's. Crack, repair, crack again. The reality is, the whole box is to thin wall and not suited to constant, high rpm. Even the cup center's crack and they are thicker.

I eventually put a whole RSR style system on, that is thicker wall and better quality of stainless. It has lasted significantly longer, but it will eventually crack. These days, I break the straps holding the box on as its clear the vibration problem moved. Thankfully, they are cheaper than repairs where and easier to keep spares in the trailer.
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Old 03-17-2017, 09:41 PM   #34
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Quote:
Originally Posted by garyever View Post
It only took me 5-6 track days after deleting my side mufflers at 23,000 mi. to blow a hole the size of a hardball through the middle section of the front side of my center muffler with numerous cracks extending to within 9" of each end. Stock engine, no ECU tuning, and no backfires other than an occasional throttle lift poping normal to 2007 .1 GT3. The front side looked to be in perfect shape at the time of the side muffler delete. . The extended cracks looked like vibration fatigue working its way from the center to the ends slowly creeping out both directions to destroyi the entire front side panel. Am now welding the cracks and covering everything with a stainless cover plate full length of the front side of the muffler to see if that will serve as a suitable repair and will post an update if it holds up or not.

Anyone contemplating a side muffler delete should consider reinforcing the frontside of the center muffler before deleting the side mufflers.
Whose side delete pipes did you use?

This is interesting, I've well, a LOT of days and my center is perfect. The cup center has same internal design and metal gauge, buddies have this and we're not blowing the rears out.

Now, i have seen the TI mufflers blow for sure.
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Old 03-18-2017, 01:23 AM   #35
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Old 03-18-2017, 11:44 AM   #36
David911
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Can't speak for everyone, but for me the best place to reduce some weight is the driver - 10lbs would be great. Cheapest option as well. Need to stop

Just sayin,


David
2008 GT3 - yellow
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