Need a break from the rasp.

[Jpump]

So, I currently have Stainless Power catless headers with a Corsa Extreme catback. Since I went catless in April, the rasp has gotten pretty bad. When I had cats, it was tolerable, but I need a long break from it. I saw Lethal Performance in the last few months released a resonated doubled H pipe with 2 MBRP resonators on it and I'm thinking that should help cut out some of the rasp, and give me a deeper sound overall. I could have 2 resonators welded in on my current exhaust, but after parts and labor it's probably pretty close to the price of the Lethal Double H Pipe.

https://www.lethalperformance.com/l...ipe-2015-2026-ford-mustang-gt-dark-horse.html

My only real concern is I may have to modify the H pipe. My current Corsa X had to have a few inches cut off each tube to connect to my headers when I had them installed 18 months ago.

Has anyone used this H pipe, and if so, what's your opinion on it?

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[ktmracer1976]

Havent used that H pipe but have the same car and exhaust and it was to loud as well. I went to a muffler shop and they cut out one of the h pipes and added two resonators and the rasp is all but gone now. Couple of pool noodles for the cold start and i am officially not a douche to my neighbors at 6 am with my cold start.

 

[qwiknotch]

I put on the Magnaflow 12469 and it made it sound better than it ever had.
No rasp, cold start is tolerable and it sounds really good in the higher RPM

 

[RNM]

I went with the magnaflow 11386 and I love how it sounds with kooks headers and stock catback.

 

[SheepDog]

So, I currently have Stainless Power catless headers with a Corsa Extreme catback. Since I went catless in April, the rasp has gotten pretty bad. When I had cats, it was tolerable, but I need a long break from it. I saw Lethal Performance in the last few months released a resonated doubled H pipe with 2 MBRP resonators on it and I'm thinking that should help cut out some of the rasp, and give me a deeper sound overall. I could have 2 resonators welded in on my current exhaust, but after parts and labor it's probably pretty close to the price of the Lethal Double H Pipe.

https://www.lethalperformance.com/l...ipe-2015-2026-ford-mustang-gt-dark-horse.html

My only real concern is I may have to modify the H pipe. My current Corsa X had to have a few inches cut off each tube to connect to my headers when I had them installed 18 months ago.

Has anyone used this H pipe, and if so, what's your opinion on it?

I have the double H pipe (non-resonated) and Stainless Power headers. The good thing is, you can buy 3" transition tubes from Stainless works as well, and get rid of the 2.25" choke point in the factory exhaust. The nice thing about the Corse double H, is that it comes with adapters for the factory exhaust, or 3". You would just need (2) 3" butt clamps, and then cut off the flared section of the transition pipes.

 

[Jpump]

I have the double H pipe (non-resonated) and Stainless Power headers. The good thing is, you can buy 3" transition tubes from Stainless works as well, and get rid of the 2.25" choke point in the factory exhaust. The nice thing about the Corse double H, is that it comes with adapters for the factory exhaust, or 3". You would just need (2) 3" butt clamps, and then cut off the flared section of the transition pipes.

I already have full 3 inch. I'm just assuming I have to cut the same pieces off with the lethal h pipe.

 

[SheepDog]

I already have full 3 inch. I'm just assuming I have to cut the same pieces off with the lethal h pipe.

It just depends on whether your "S" shaped transition pipes from the cat into the resonator are flared, or are straight. If they are 3" OD, then you shouldn't need to cut anything, and they will slip into the H-pipe flares.

If you have the Aftermarket Connect transition tubes, then they should slip right in to the flared ends of the Double H

 

[robvas]

Two short resonators will likely not get rid of it all. I would go with a larger muffler-style resonator if I were you.

 

[SheepDog]

The problem here is the Corsa Extreme Catback. - Impossible to make sound good or clean.

 

[CarDad29]

I put on the Magnaflow 12469 and it made it sound better than it ever had.
No rasp, cold start is tolerable and it sounds really good in the higher RPM

I have about the same setup (LTH, MBRP street, and this resonator) and it does sound amazing (well did until a crack) but the mid section is a single 2.5" diameter and shown to leave power on the table with 10PSI boost... Looking for an alternative to that, since I have another crack before the resonator, considering replacing the whole "cat back" with a Thermal R&D system and adding that Jones mid muffler...

I really hope it comes close to comparable in taming volume as with the 12469, doubt it will sound as good though.

 

[NightmareMoon]

Two short resonators will likely not get rid of it all. I would go with a larger muffler-style resonator if I were you.

this is what my instinct says too. No experience with that Lrthal part but it sure is nice to see more resonated pipes on the market.

 

[NJ3]

The problem here is the Corsa Extreme Catback. - Impossible to make sound good or clean.

This. I removed the Corsa X pipe and installed the factory resonator.
This eliminated the rasp and created a nice deep tone. My only complaint is that I would like the exhaust to be louder in track mode.

 

[fmc_smt]

I had basically the same set up , switched to the Corsa Tourring Axle back . Made a world of difference

 

[Snooty]

The way I think of it as someone who has worked previously in audio engineering/acoustics and now has involvement in developing an exhaust sytstem for the mustang, is the Coyote has its own sound characteristics, frequency bands depending on RPM range which is also influenced by the firing order of the engine.

Nearly ALL exhausts on the market are just conventional in design with their on brand characteristics. Ford tried to make the car sound more like a muscle car from factory, meanwhile traditional muscle car V8 exhausts either play into the firing order negatively (in my opinion) or sound way too raspy.

I am still prototyping and in the early stages however the current midpipe I have on my car has retains just enough edge (not quite"rasp") where it sounds like a motorsport V8 but still sounds smooth and "tuned". The next stage will be headers to integrate into this prototype to be what you would expect from headers in terms of performance (or better) but with a far different sound characteristic.

TLDR; these cars have unique motors, they benefit from experimentation with the exhausts to find the right thing for you.

 

[2015 Silver GT]

I left the factory resonator and active exhaust cat back and eliminated all the work and money many go through to get back to the deep stock setup.

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