Help Kooks Headers vs Corsa CB Exhaust

[CBH]

I have a thread here about my exhaust mods. I replaced factory mufflers with aftermarket pass-through mufflers. Re-used factory tips. Local shop custom made all the mods for under $750. It sounds much better, but still not enough for me.

Its noticeably louder than stock with the flaps open. But still quiet enough that you don't notice it while maintaining conversation with your passenger. The flaps still quiet it down if necessary, but I never find it to be so.

Unfortunately, the shop nor I knew about the procedure to re-link the ECU with the muffler flaps, so I did get a CEL even though I changed nothing related to cats or upstream from the mufflers.

I don't understand why y'all are even considering keeping stock mufflers with headers though. It defeats the whole point of headers to keep stock mufflers.

My warranty is up next Spring, so I plan to add the Kooks and get it tuned anyway. I figure the flaps will keep it contained enough if I ever need to. The tune is ridiculously expensive, but there are few conveniences I just want to have....and killing the CEL will be nice. Ironically, the CEL is hidden behind my steering wheel, so I forget about it.

Can't wait to fire it up after that

 

[flipray]

Can anyone out there speak to the sound difference between factory headers and an aftermarket CB exhaust vs aftermarket headers, green cats and a factory exhaust? I assume headers and green cats would be louder? I have listened to so many videos and honestly I really can’t hear that much of a difference with the CB exhaust but that might just be the video.

I went with Kooks 2" uncatted first. Kept the stock mufflers and I still think they were too quiet. Ended up getting Corsa axle backs.

I just installed the Corsa cat back exhaust on my 2026 5BW yesterday. I cant recommend it enough. Huge sound improvements. Much louder but nice and deep with no rasp and no drone. I have a friend who is planning to install Kooks headers while keeping stock exhaust. I’ll do a sound comparison as soon as he does it.

Corsa Catback by itself is going to be louder than Headers to stock mufflers. Corsas open is just more rowdy. Valves close, they're quieter than the stock mufflers i think.

 

[marcmac]

I just installed the Stainless Works catback Exhaust, the sound is loud and deep way louder than stock . They ship with new springs for the valve motors. Did not have to do a valve relearn. Im satisfied with the Exhaust.

 

[flipray]

I just installed the Stainless Works catback Exhaust, the sound is loud and deep way louder than stock . They ship with new springs for the valve motors. Did not have to do a valve relearn. Im datisfied with the Exhaust.

Got a photo of the springs? Cuz I absolutely loathe these things falling off.

 

[marcmac]

Got a photo of the springs? Cuz I absolutely loathe these things falling off. View attachment 33430

No I didn't get a photo of them. They look similar to stock but the trasition to get them on the motors were a breeze. Maybe if you message stainless works or tapout they can get you a picture of the springs.

The set came with new springs and hardware to mount to the mufflers, and a wiring harness extention since the motors are mounted different from stock and the corsa mufflers from what I've seen.

I screenshot a pic from the install instructions.