Made a huge mistake…Cat Delete

[CSfastlane]

I have a habit of not leaving well enough alone. So got this great idea to install 2m cat delete pipes on my 2019 mustang gt. I have a full roush catback with x pipe. Loud is an understatement, the loudness doesn’t bother me but it’s not a good loud. It drones so bad at low rpm, it’s embarrassing. It almost sounds like a straight piped truck with glass packs. I have some vibrant resonators I could put in ,but I am not sure that will tone it down enough. Honestly thinking about putting my cats back in. I was thinking I could just weld a flange on the driver side cat that was cut off , so I could bolt them back in.Since I had a flange welded on the driver side header for the cat delete pipes. The guy mentioned that a flange wouldn’t be able to be welded on since it was cut so close. I have attached a picture of my driver side cat. Has anyone else been able to weld a flange on and bolt their cats back? Anyone else regret doing cat deletes? Did you put yours back in or add something to tone it down?

Sponsored

 

[Andy13186]

I got varex xforce active system, helps a ton on cold starts, its loud but doesnt drone at all with the valves open. Dont go WOT with the valves closed, too much backpressure.

 

[Dave2013M3]

I have a habit of not leaving well enough alone. So got this great idea to install 2m cat delete pipes on my 2019 mustang gt. I have a full roush catback with x pipe. Loud is an understatement, the loudness doesn’t bother me but it’s not a good loud. It drones so bad at low rpm, it’s embarrassing. It almost sounds like a straight piped truck with glass packs. I have some vibrant resonators I could put in ,but I am not sure that will tone it down enough. Honestly thinking about putting my cats back in. I was thinking I could just weld a flange on the driver side cat that was cut off , so I could bolt them back in.Since I had a flange welded on the driver side header for the cat delete pipes. The guy mentioned that a flange wouldn’t be able to be welded on since it was cut so close. I have attached a picture of my driver side cat. Has anyone else been able to weld a flange on and bolt their cats back? Anyone else regret doing cat deletes? Did you put yours back in or add something to tone it down?

You need to get rid of the Roush axle back. I never thought these sounded good with an xpipe let alone catless. Yes they are loud but when pushing past 4k rpm the exhaust tone becomes a mess. Believe it or not go with a Ford Performance by Borla Sport or something of that equivalent. You don't want a race type muffler as there is no tone control. You're are going to get a bunch of opinions, but one is pretty much accepted, to ditch the Roush axle back.

 

[Justgonna send it]

Corsa SPORT mufflers
Not extreme. Can’t stress that enough

 

[Ewheels]

As far as welding...get a second opinion. You could easily weld a flange on that.
I used to work in fuel systems for the company that made the fuel lines for Boeing's aerial refueling 767 planes for the military. They did much more complex welds than that. It's easily possible.

 

[jacknifetoaswan]

You need to get rid of the Roush axle back.

Farts and yelling. My buddy had one with an X-pipe and I was so proud about it, but I always through it sounded terrible. Probably the only thing worse is a straight piped Coyoted.

JR

 

[Dave2013M3]

Farts and yelling. My buddy had one with an X-pipe and I was so proud about it, but I always through it sounded terrible. Probably the only thing worse is a straight piped Coyoted.

JR

You get what you pay for...I had the Steeda Axle Aggressive Axle backs. I am positive they are made by the same manufacturer. With the stock suitcase resonator it sounded pretty good. Put on the Borla Switchfire, I hated it. Raspy, uncontrolled and just a mess after 4krpm.

 

[arghx7]

I've been pretty happy with my factory active performance exhaust in sport mode...

 

[ZXMustang]

Yeah you'll need like two sets of mufflers installed on these. I have TSP Long tubes with no cats but through the completely stock active exhaust and its LOUD and raspy in anything but quiet mode. Quiet mode is a god send for normal driving. Otherwise its too loud and ratty.

 

[CSfastlane]

I've been pretty happy with my factory active performance exhaust in sport mode...

You have cat deletes,?I still have my stock active exhaust, thought about putting the mufflers back in for now until I can figure out what I’m going to do.

 

[stannypack]

Farts and yelling. My buddy had one with an X-pipe and I was so proud about it, but I always through it sounded terrible. Probably the only thing worse is a straight piped Coyoted.

JR

MBRP Race is basically a straight pipe (besides those 2 little j shaped resonators) but it sounds great

 

[CorvZ061]

You get what you pay for...I had the Steeda Axle Aggressive Axle backs. I am positive they are made by the same manufacturer. With the stock suitcase resonator it sounded pretty good. Put on the Borla Switchfire, I hated it. Raspy, uncontrolled and just a mess after 4krpm.

I’m pretty sure you’re right. I had the Steeda aggressive tone axle backs on my old PP1. After adding their H pipe it was it just never sounded good. Too loud inside, but also trumpety outside. Swapped to a whole cat back from someone else it was just bad.

 

[CSfastlane]

You need to get rid of the Roush axle back. I never thought these sounded good with an xpipe let alone catless. Yes they are loud but when pushing past 4k rpm the exhaust tone becomes a mess. Believe it or not go with a Ford Performance by Borla Sport or something of that equivalent. You don't want a race type muffler as there is no tone control. You're are going to get a bunch of opinions, but one is pretty much accepted, to ditch the Roush axle back.

I’m probably going to throw my stock active exhuast back on for now so it’s drivable, and then figure out if I’m putting my cats back in or find a different setup.

 

[Dave2013M3]

I've been pretty happy with my factory active performance exhaust in sport mode...

Add a Borla Switchfire, you will be even more pleased.

 

[Dave2013M3]

I’m pretty sure you’re right. I had the Steeda aggressive tone axle backs on my old PP1. After adding their H pipe it was it just never sounded good. Too loud inside, but also trumpety outside. Swapped to a whole cat back from someone else it was just bad.

Yea that trumpety noise was the deal killer for me. Then above 4k rpm it was just a cacophony of noise.

Sponsored