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Premium Member
2004 SLINGSHOT
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51 Posts
Discussion Starter · #1 ·
Hey guys! Has anybody ran into the burning of the fascia with running the cat back system? Iam just on a trip right now and after about 700km , I noticed the driver side outside part of facia , melting the paint than the ABS.. I got a couple of pics , it’s centered in exhaust opening. Iam not sure why this would be doing this , airflow under truck? I’ve put reflective tape around the problem spot , till I get back home to deal with it . Thanks in advance.
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Wheel Tire Automotive tire Hood Automotive lighting
 

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Premium Member
2004 SLINGSHOT
Joined
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51 Posts
Discussion Starter · #8 · (Edited)
That is because the Magnaflow 5" tips do not have adequate cooling airflow on the outer shell. I've seen it happen to several SSRs in the last 17 years. The Bosal 5" tips had a tendency to do the same thing, for the same reason.

Mike
Thanks Mike, any solutions to this issue? Different tips , SE ?
 

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Premium Member
2004 SLINGSHOT
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51 Posts
Discussion Starter · #15 ·
The exhaust system grows longer when it gets hot, especially when driving for a while, and then it pivots on the driver's side mount which is located more forward on the Magnaflow exhaust than the stock mount. I also recall the Magnaflow is inboard versus the stock being outboard, but the movement fore and aft is the bigger factor in movement and stability of the tip. In my opinion, it all makes difference. The reason the Maganflow exhaust doesn't use the existing mount is because their exhaust does not go outboard of the frame rail like the stock one does. When I had the "kick out" made for my exhaust so I could carry a spare, I went back to using the existing stock mount.

To Mike's comment above, the polished part of the tip that you don't see unless you are laying under the truck after they are installed, or staring at the last few photos of the tips on his website, are actually open to the incoming air vs. closed back down onto the pipe. This allows them to dissipate heat better.

I feel like quoting @SWT RYD here, and saying something about "...staying at Holiday Inn once", :LOL:, (so I will). But I have actually measured and studied the geometry and done some measurements🤓.

The drone experienced in mine was very likely due to a combination of removing the stock inlet pipe, which has a neck down just before the muffler, and less baffling in the muffler. I made the situation worse by installing a higher stall speed converter, but benefited greatly in the acceleration department. As stated many times in various threads GM did some significant work on exhaust system to get rid of the drone.

@DOOPHUS I respect your 2 cents worth. As we all know the exhaust sound is a personal one, hence I preface my comments with "I honestly like" and later on state "many folks run them and like them". That said, everyone liked the way mine sounded too, but they didn't ride in my R for hours at a stretch. I personally prefer the sweet rich smell and sound of my 454 with side pipes, but I don't fancy driving it across Texas without hearing protection :oops:.

@Baggerboy1969 - I did not answer your "best" question, as almost any answer is subjective. There is no "best". There are many folks that like the raspier sound of the stock tips and think those of us that have changed them have made the exhaust sound worse. I've that R owners tell me that directly. I obviously don't think so, but I respect their opinion.

Magnaflow makes a good product and they've sold many sets for the SRRs. They work fine in many cases and many people like them.

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Premium Member
2004 SLINGSHOT
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51 Posts
Discussion Starter · #18 ·
It looks to me, from the above pictures, that possibly some sort of repair was performed on the damaged area of the rear panel. I think it possible a filler material was used in the affected area that is less heat resistant than the panel sheet itself. It looks as if the filler is flaking away at that point and taking the paint with it. That might explain why few others have had an issue in this area. Just a speculation on my part.
The flaking portion is from the paper backing of the reflective tape , trust me there is no filler in this area. I can’t get a great pic of this , but above the effected spot the plastic has bubbled up quite a bit. That being said , after I repair it there now there will be filler material. I’ve sent off a email to Magnaflow , not expecting anything , just wanted them to see potential damage that may be incurred from using this system . I’ll keep the group posted on it if any or no response is acknowledged by them.
 
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