Put Borla XR1 Catback on the Shelby

06torchredgt

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First off, my apologies for resurrecting such an old thread, however, I just recently came across this thread after searching the subforums. Anyway, I'm seeking advice from anyone who has any type of knowledge or personal experience with the Borla (140210) aka XR-1 multi-core Catback exhaust? My reason for concern is that several tech support reps from Borla have all recommended this multi-core cat-back system in which they claim will not produce any resonance drone on a 2007-09 Shelby GT500. They also claim that despite the fact that I own a 2006 Mustang GT with a Saleen Series VI supercharger, the Borla (140210) multi-core exhaust system will also be compatible with a 4.6L supercharged 3 valve application. At any rate, I've been running the Borla S-Type paired with the Mac ProChamber for nearly 2 years now and although I really like the overall sound from the outside of the car, however, I cannot deal with the annoying interior resonance drone between 1500-2500 RPM on the highway. Therefore I really have no other choice but to make a change. I also asked the folks over at Borla about making the switch from the S-Type to the Borla ATAK and they said the ATAK mufflers are tuned and designed specifically for only naturally aspirated 4.6L 3v Mustangs and would therefore not be recommended for my supercharged application, as the blower would change the sound of the exhaust note and also increase the volume as a direct result. Anyhow, I received the Borla multi-core system a few days ago, but I'm not quite certain as to whether or not I should install it or just return it back? As the last thing I need to be worried about is ending up with another exhaust system that I'm not going to be very happy with. Needless to say, my only other choice would be either the Roush Extreme Catback exhaust with axle-back delete pipes or possibly the Ford Performance FR500S axle-backs aka KR's. However, I would prefer either the Borla ATAK or the Borla (140210) multi-core cat-back exhaust, providing they would be compatible with my particular application that doesn't produce obnoxious resonance drone. In the meantime, I'd be really grateful if anyone might be able to provide any type of feedback and support. Thanks in advance.

https://www.svtperformance.com/threads/put-borla-xr1-catback-on-the-shelby.493307/
 
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GodStang

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I am running Borla XR-1 on my 03 Cobra. I was recommend to run the multicore ones because of my high Boost. My boost level would of blown out the stingers or ATAKs. I advice you to listen to clips on YouTube and find what you like.
 

06torchredgt

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I am running Borla XR-1 on my 03 Cobra. I was recommend to run the multicore ones because of my high Boost. My boost level would of blown out the stingers or ATAKs. I advice you to listen to clips on YouTube and find what you like.

I'm referring to the Borla 140210 multi-core cat-back designed for the 2007-2009 Shelby GT500. The Borla XR-1 multi-core that you're running on your 03 SVT Cobra is designed and tuned for the 4.6L 4v Cobra S/C and not for the Shelby 2007-09 GT500 5.4L 4v S/C. Therefore we're looking at 2 completely different exhaust systems, designed and tuned for 2 completely different engines.

As for boost levels are concerned, my boost at the maximum is at 7.5 psi with a 3.6" pulley. So I highly doubt that my boost level would be considered as high enough to blow out Stingers or ATAKs? Otherwise, I would've already blown out my Stingers after nearly 2 years of running them.

In regards to listening to sound clips, I've found only two on YouTube for the Borla 140210 multi-core cat-back exhaust designed for the 2007-09 Shelby GT500. Needless to say, both sound clips didn't provide very good sound quality to say the very least. I was also only able to find one sound clip on YouTube for the Borla 11784 multi-core axle-back exhaust designed for the 2010 Shelby GT500 which is still in production, but I don't know for certain if the multi-core design between the 11784 and 140210 are similar or not?
 
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RBB

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According to their website, the 140210 includes S-type mufflers. I'm running S-types with headers and an off-road X pipe. It definitely drones at highway RPMs, and is loud as hell in general. Doesn't bother me much since it's not a DD, but your mileage may vary. Here's a clip at idle....probably not what you're looking for.

I'd imagine the S-types would drone with any off-road midpipe. I'd switch back to the stock midpipe if you want to run them.

 
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GodStang

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I am not sure what you mean by “Tuned for”. I am not running a Borla Catback as they don’t make a 3” IRS one for my car. I am running a different catback that I swapped the XR-1 Multicores into.


I'm referring to the Borla 140210 multi-core cat-back designed for the 2007-2009 Shelby GT500. The Borla XR-1 multi-core that you're running on your 03 SVT Cobra is designed and tuned for the 4.6L 4v Cobra S/C and not for the Shelby 2007-09 GT500 5.4L 4v S/C. Therefore we're looking at 2 completely different exhaust systems, designed and tuned for 2 completely different engines.

As for boost levels are concerned, my boost at the maximum is at 7.5 psi with a 3.6" pulley. So I highly doubt that my boost level would be considered as high enough to blow out Stingers or ATAKs? Otherwise, I would've already blown out my Stingers after nearly 2 years of running them.

In regards to listening to sound clips, I've found only two on YouTube for the Borla 140210 multi-core cat-back exhaust designed for the 2007-09 Shelby GT500. Needless to say, both sound clips didn't provide very good sound quality to say the very least. I was also only able to find one sound clip on YouTube for the Borla 11784 multi-core axle-back exhaust designed for the 2010 Shelby GT500 which is still in production, but I don't know for certain if the multi-core design between the 11784 and 140210 are similar or not?
 

06torchredgt

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According to their website, the 140210 includes S-type mufflers. I'm running S-types with headers and an off-road X pipe. It definitely drones at highway RPMs, and is loud as hell in general. Doesn't bother me much since it's not a DD, but your mileage may vary. Here's a clip at idle....probably not what you're looking for.

I'd imagine the S-types would drone with any off-road midpipe. I'd switch back to the stock midpipe if you want to run them.


The website says, Satin S-styled mufflers and based from the XR-1 multi-core race series mufflers. Also, I've already looked inside the mufflers and there are 4 cores. The S-Types have just 1 core. IMO your drone issues are more than likely from running an off-road X pipe. You may want to consider running high-flow cats along with either a ProChamber or H pipe. And yes, you're absolutely spot on about the S-types, as they will indeed drone with any off-road mid-pipe. And unfortunately, they also drone with the stock catted mid-pipe, as I did try switching back. All that did, was just dampen the drone a bit but was still very noticeable and I also lost quite a bit of sound volume in the process as well, so I ended up switching back to the off-road ProChamber.

Are you still going to run the Mac Prochamber with the new exhaust? Maybe thats whats causing the drone?

I haven't installed the new exhaust yet, because I'm not sure if the Borla 140210 multi-core cat-back system is compatible for a 4.6L supercharged 3 valve. It was designed and tuned for the 2007-09 Shelby GT500 5.4L supercharged 4-valve. The ProChamber, according to Mac Performance is designed to help reduce drone. Therefore I don't think its the ProChamber that's causing the drone. it's definitely the Borla Stingers. I also read a post from a member on this site who has the 'cut n clamp" ProChamber paired with the Ford Performance FR500S KR axle backs and stock cats who claims to have zero drone.
 
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06torchredgt

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I am not sure what you mean by “Tuned for”. I am not running a Borla Catback as they don’t make a 3” IRS one for my car. I am running a different catback that I swapped the XR-1 Multicores into.

What Borla means by " Tuned for" is they tune for each individual engine, as in the sound frequencies that each produce during the design process. At least that's how I interpret it anyhow. I also understand where you're coming from now, as you're referring to the XR-1 universal multi-cores that splice into the OTA pipes if I'm not mistaken?
 

Recon

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I have Roush Extreme axelbacks on my 427R and FR500S on my GT. I can tell you both drone on stock exhaust systems. FR500S does a little but is definitely not bad; the Extremes on the other hand are very noticeable. Drone doesn’t bother me at all but you might look at other systems.


Pick your poison.
 

06torchredgt

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I'm not very familiar with the Roush Extreme axle backs, but from my understanding, forum member Steel Town Stang ran the Roush Extreme Cat-back on his "08" GT500 which is the mid-muffler version that uses high-flow resonators in the OTA pipes between the crossover and rear axle sections. It's pretty much an axle-back delete exhaust. Anyhow Steel Town Stang had claimed he never experienced any drone with the Extreme cat-back exhaust system. Supposedly from all the reviews, I've read on several Mustang site forums including this one, The Borla ATAK, FR500S, and Roush Extreme cat-back exhaust seem to all be well known for producing the least amount of interior resonance drone when ran on stock exhaust systems (factory cats) Anyhow, just saying.
 

Recon

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No experience with the catback Roush Extreme, but the axelbacks will drone, as they do on my Roush. It drones more that the factory Roush exhaust I had which are rebadged Stingers. FR500S is very little, but I have experienced drone with them. If I had to do it over again I’d still pick the mufflers I choose. Now when I put the headers and off-road midpipe on the Roush I’ll switch to a less rowdy system, potentially ATAKS or I have Roush’s stage 3 “street legal” mufflers.
If I actually get the other 427R I’m looking at I plan on Extreme catback for that car.


Pick your poison.
 

06torchredgt

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Yes, I'm very familiar with the factory Roush exhaust as rebadged Borla Stingers and you would think they would drone just as bad as the authentic Stingers, as my Stingers drone horribly with the stock exhaust and obviously more so when running off-road. At least it's good to know that you only experience very little to minimal drone with the FR500S. However, I would not recommend running Borla ATAKs with headers and especially on off-road mid pipes, otherwise, you're going to end up with far more than just a rowdy system lol. IMHO, I think you'll be far better off with the Roush stage 3 "street legal" mufflers or look into the Roush Extreme cat-back system as an alternative.
 

biminiLX

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Sorry no advice on our cars, but a custom Prochamber to dual Borla Pro XS mufflers on my ‘04 Cobra was one of the best exhausts I’ve ever had—deep and mellow around town, zero highway drone and great WOT.
I think the XS is Borla’s basic turbo muffler, but not sure how it relates to their new naming system.
-J
 

06torchredgt

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IIRC, I believe the Borla Pro XS series mufflers are Borla's basic turbo/multi-core muffler, just as you brought up and also might be similar with their XR-1 series race design as well, but that's just an assumption on my part lol. IMO I think most of the drone issues on the 2005-10 4.6L cars is due mostly from the design of the 3 valve motor and also from the location of the mufflers to the rear. If Ford, on the other hand, had kept the mid-muffler design in place from 99-04 along with retaining the 2 valve 4.6L? I really don't think interior resonance drone would be quiet as much of a factor lol.
 

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