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Cat-Back Comparsion


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Need your opinion on this and this really only applies to the 07-08 Shelby GT owners or 05-09 Mustang GT owners with the 4.6 3v engines

 

Has anyone installed the Kooks X-Pipe or H-Pipe w/ their Kooks Cat-back? If so, what do you think of the sound from idle to wide open throttle even highway cruising at 75mph compared to Magnaflow, Borla, Flowmaster?

 

I currently have JBA shorties w/ Magnaflow X-Pipe w/cats and Magnaflow Cat-back and ever since I got my 2013 GT350 that has the Borla exhaust my 08 is very quiet. I have other Mustangs yet the Magnaflow's seem to be in whisper mode so I'm interested in changing the mufflers to have the great Mustang sound but not that obnoxious sound

 

Any opinions?

 

The 5.0 Coyote puts off a different sound so I can't really look for what I want on youtube because almost every Mustang with the Kooks cat-back is a Coyote powered car

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I had an '07 SGT with the Pypes Delete system on it and it was awesome. Great sound on start up and acceleration but calmed down to a reasonable rumble at speed. Here's one site to check them out:

http://www.americanmuscle.com/pypes.html?utm_source=google&utm_medium=cpc&utm_term=+pypes&utm_campaign=S%2B-%2BGeneric%2BBrands%2BGeneral%2BNo%2BYears&utm_content=sptfXG2EU|30125854977&gclid=CPCzpurJtbwCFUk-KwodFS0AAA&gclsrc=ds

 

John

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Ford Racing M-5230-GTA or M-5230-GTB are my recommendation for your current setup.GTA's being slightly louder than GTB's, but GTB's being better quality, in my opinion.

These Shelby GT's came with a Ford Racing x-pipe and cat-back and didn't like it at all

 

Its hard to choose because when I hear those cars with loud crackling exhaust that is annoying

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the magnaflow cats are louder than stock. that's why i'd stick with a chambered muffler. personally, i like a loud, crackling sound. the Shelby GTs sounded great right off the dealer floor. if you want it quieter then go with the GTB (Bullit) mufflers. They have the same tips as the GT500KR, which look great in my opinion.

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the magnaflow cats are louder than stock. that's why i'd stick with a chambered muffler. personally, i like a loud, crackling sound. the Shelby GTs sounded great right off the dealer floor. if you want it quieter then go with the GTB (Bullit) mufflers. They have the same tips as the GT500KR, which look great in my opinion.

 

I want louder than the Magnaflows that are on there now. They seem to have gotten quieter if that's possible? Reason why I changed from the Ford Racing exhaust was didn't like the sound at all and had Magnaflows on another Mustang and they sound good on that car but that one doesn't have the Magnaflow X-Pipe w/cats so maybe that is modifying the sound? I'm gonna change it just getting feedback

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it all depends on what you are looking for. if you didn't like the stock exhaust sound then it may be related to the x-pipe. i'd say you are probably correct in thinking the magnaflow x-pipe is the difference. the mid-pipe and the catalytic converters make a huge difference on the sound of these cars. what i'm trying to convey to you is that the magnaflow x-pipe with cats is going to be even louder than the OEM setup (which you want), but with the same general raspy/crackling characteristics (which you don't want). if you want that good 'ole boy, bubba truck sound (i don't) then you need to consider an h-pipe instead of an x.

 

that said, based on my experience, i'd say the GTA (OEM Shelby GT) or the GTB (Bullit Edition) coupled with your current magnaflow x-pipe and cats are your best bets for getting a more aggressive sound without any of the REALLY annoying characteristics like drone or echo. If you still had the stock cats on there, I might recommend something else as far as mufflers, but you don't. hope that helps. for what its worth, i spent a chunk of change swapping out exhaust on my GT and GT500 before i found the setup that i like. good luck.

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yep, its only money hahaha

 

When I got my 2013 GT350 Conv. at first I didn't like the Borla's on there but after awhile it wasn't that bad but then I think the GT/SC got jealous and said I want some Viagra, hence checking the exhaust systems... lmao

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  • 2 years later...

Reviving an old thread, seeing if anyone is still listening. I have an '08 GT/SC (vert, auto) and I've never been happy with the quietness of the exhaust. I rented the GT-H's several times before purchasing mine, I always loved the throatiness of them, but once I got mine, I never thought it sounded anywhere close to the way the GT-H's sounded. Mine was a GT/SC from the start, so I never owned it as a non-SC. I want a louder, throatier, muscle car sound. Not just louder, it has to sound good. Mine is strictly a Sunday driver, I'm never on the highway so I'm not too concerned about drone and the like. I've read an exhaustive (ha!) amount about long tubes, mid pipes and axle backs, listened to a million clips, still not sure how to proceed. Few if any of the audio clips have our mid-pipe, so if I only change the muffler those clips are useless anyway. I have no interest in doing this work myself, a couple of local shops have strongly advised against long tubes, and I'm sure that would be a big expense to pay for such an install at $100/hr. So, I'd primarily like to try to accomplish my goal either with just an axle back and/or a mid-pipe. BTW, 4" tips are a must. Thoughts, ideas?

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I'm suggesting "axle-back delete" as a first step. At least you'll have a perspective on how much "loud" potential you have to play with.

 

The FRPP X-pipe is said to add "raspiness" to the sound, so you might want to consider reverting to an H-pipe to eliminate that variable.

 

To my ear, the GTAs were a bit too loud in a convertible, so I put the stock GT mufflers back on; with the X-pipe that suited me fine.

 

Edit: add GTAs on a GT/CS coupe YouTube

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I read here someone added SLP Loudmouths (I believe it was supercharged as well), and liked it quite a lot, a downside to those is the 3.5" tips. I don't recall who it was, but I recall he sold the car.

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hmmm. FRPP X + GTA is the same setup as the Hertz. if you want it just a touch louder and a small bump in power, i'd suggest replacing the mid-pipe with one that has hi-flow cats. X if you like the overall sound as it is now, or an H if you want the old truck sound.

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replacing mufflers will change the overall sound quality more than a midpipe. and potentially make it louder or quieter. in other words, changes too many things at once, not just volume. plus, you also gotta consider drone and volume at different RPMs. mufflers affect all that more than mid-pipes.

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Here are a few clips however my car has long tube headers.

Basani's

https://www.youtube.com/watch?v=7L5NAanaSMQ

 

MAC/w shorty headers

https://www.youtube.com/watch?v=hPHtO2xQf8M

 

Borla touring with H pipe and Long tubes

https://www.youtube.com/watch?v=pb_MQUe2-p8

 

Borla ATAKS with Long Tubes and cats

 

https://www.youtube.com/watch?v=xtENcItltd4

 

long tubes with cats and FRP GTA's

 

https://www.youtube.com/watch?v=p61lGisipug

 

I love the Basani's great deep sound yet the sound great when on the gas.

My current setup is LT's with cats and KR500's they are loud but it sounds great. The ATAKs sound great as well but they crackle and pop as do the KR's.

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The supercharger will change the sound. The stock GT-H had a different intake (obviously). You never mentioned what kind of SC you have? My car has a whipple, and the blower will easily overpower the exhaust sound. I had Magnaflo mufflers and then changed back to stock. The Magnaflos were too quiet, I think.

 

https://www.youtube.com/watch?v=eP3msVx3_po

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The supercharger will change the sound. The stock GT-H had a different intake (obviously). You never mentioned what kind of SC you have? My car has a whipple, and the blower will easily overpower the exhaust sound. I had Magnaflo mufflers and then changed back to stock. The Magnaflos were too quiet, I think.

 

https://www.youtube.com/watch?v=eP3msVx3_po

Nice!

 

Even the bird approved of the FRPP's!!!! :hysterical2:

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The S/C is a KB. Unfortunately, it's difficult to find a Youtube clip of a supercharged, stock header FRPP x pipe clip, to even try to find an axle back that sounds good. Not sure an axle back alone will give the great sound I'm looking for. I'm suffering from paralysis by over analysis.

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Try the FRPP GT500KR mufflers. I switched to these years ago and love them on my SGT vert. Only other change was the shorty tuned headers I also added. I take mine to the track once a year and get tons of complements on how great my car sounds at WOT. I will see if I can get you a link to a video I had a fellow Mustang driver shoot of my car at speed while he was standing trackside.

 

I still have stock x pipe and cats...

 

Andy

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To me, my Shelby sounds nothing like the GT-H's I rented, I rented 4 of them (two '06, two '07), probably for a total of 15 days. They were loud and throaty, sounded great. Since mine was supercharged at Shelby, I never drove it as N/A. From this I surmise the supercharger has a significant impact on the exhaust note, although others have said to me it should not. Has anyone put a KB on and noticed this difference, or is it just different from the GTH's? Or maybe I'm going deaf? Ultimately, I want to know how to make my supercharged GT sound great (and pretty loud).

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I did my SC conversion in 2013 with the KB and my exhaust is still stock. There really isn't a difference in the sound over the n/a car until you get on it. The awesome sound of the KB kicks in and does over power the exhaust sound. When I tracked it at the Bash, it was the most quiet car out there. I think I am ready for a change also, but still trying to decide which way to go without going too loud. I would prefer a deeper sound with no drone.

Nick

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