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11-09-2020, 11:08 AM #1
Need some exhaust help please...inside>>>
Ok I've gotta pick your collective brains a little and really hope someone can help me out... So I bought a set of Borla p/n 40842S (S-Type mufflers) that are basically what comes with the Borla S-Type Cat-Back exhaust system and installed them Friday. And now my car basically sounds like an old school hotrod with glass packs. I mean that muffler is more or less a glass pack style muffler only with 21st century technology. It actually doesn't sound much different than the 40 Series 2-chamber Flowmasters they replaced. But here's the deal and this is where I hope someone can help me: I am the second owner of this car. But I've owned it since 2007. And the only thing I haven't touched in the 13 years I've owned it is the exhaust system. I've been through the engine and still never altered the exhaust. Up until Friday, the car has had mid length Bassani headers through a Bassani X pipe and out the back through the Flowmaster mufflers. There have never been cats on this car in the 13 years I've owned it. There are no resonators on this car (did they come stock on these cars??). So I was under the impression that it was the mufflers only that gave the Borla cat back exhaust with the stinger muffler that signature exotic, raspy and crackling sound. And that clearly is not the case. What is missing??? All this to say...do the factory catalytic converters somehow play a significant role in that signature sound or is there another component missing from the factory exhaust like a resonator? I don't know and that is where I am hoping someone can get me pointed in the right direction. I want my car to sound like what a 2003 Cobra with the Borla Stinger S-Type Cat-Back Exhaust system should sound like. And not like a freakin truck with glasspacks
11-09-2020, 05:35 PM #2
For what it's worth, my 2001 Cobra has a Borla Attak cat back with un touched factory cat converter mid pipe/ JBA shorty headers and the car sounds lovely. Closest that I can compare the exhaust sound to would be an AMG Merceds. My car with the Borla Attak cat back system definitely does not sound like an old truck. I would say that having the factory cat converter H pipe and a complete cat back rather than welding mufflers onto factory pipes is going to make a difference in the sound.
Last edited by cobraracer46; 11-09-2020 at 05:38 PM.
11-16-2020, 04:28 PM #3
No the 2003-2004 Cobras did not come with resonators. I think the difference your hearing is what was mentioned above! Your stock exhaust is 2.25” diameter and uses an H pipe. The Borla catback is 2.5” and uses an X pipe. Those 2 things alone will drastically change the sound of the exhaust you have verses one with the actual Borla catback.
11-16-2020, 04:53 PM #4
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I guess it's worth mentioning that over the weekend, I let a buddy of mine drive it at his place. He has an 1 1/8" mile track around his house so it's nice to be able to use something like this for testing grounds lol. Anyway I will say I was a little surprised to find that the exhaust note from the outside sounds noticeably different than what it sounds like on the inside while driving. I actually thought it sounded pretty damn good. Exactly what I'm looking for? Eh...probably not. But not too far off either now.
11-16-2020, 08:16 PM #5
My bad. I misunderstood and thought you welded the mufflers into a stock exhaust set up with Bassani headers.