[raym3cs]

RedStar Exhaust just released Catless/Catted Downpipes for the new G90/G99 M5.

https://redstarexhaustusa.com/bmw-g9..._02_spacers-no

I used their 200 cell catted downpipes on my Audi RS6 for about eight months without flash tune and had no check engine light.

I'm hoping for the same results for the M5.

[Chase.]

Originally Posted by raym3cs

RedStar Exhaust just released Catless/Catted Downpipes for the new G90/G99 M5.

https://redstarexhaustusa.com/bmw-g9..._02_spacers-no

I used their 200 cell catted downpipes on my Audi RS6 for about eight months without flash tune and had no check engine light.

I'm hoping for the same results for the M5.

Please post a video when done I never have heard the new g90 with downpipes!

[carbonfiber1]

any update on this, a full set looks to go for 2400 and change but I want to make sure there is no CEL if going catless with their 02 sensor solution.

[unagedluxury]

I was the guinea pig and I’m extremely satisfied. instagram video

[carbonfiber1]

Originally Posted by unagedluxury

I was the guinea pig and I’m extremely satisfied. instagram video

did you use the catless version? I am thinking about going the same route

[carbonfiber1]

Just placed my order, I did the heat shield option after reading the FAQ. It may be a while before I can get these installed since the weather in MD is sux right now.

[Nick_G]

Originally Posted by carbonfiber1

Just placed my order, I did the heat shield option after reading the FAQ. It may be a while before I can get these installed since the weather in MD is sux right now.

Also ordered Redstar for my g90, HJS 200cell

[Crazy1323]

If you have never had a catless cat, I’d recommend against it. It might be a little better as an EV, but on catless cats in the past I noticed two big downsides:

When sitting in traffic with windows down you can get a pretty noxious odor

When driving in a garage or covered area it can get pretty noxious too.

While a little more expensive, some high flow cats seems way worth it compared to full catless. There just isn’t much performance and sound difference between high-flow and catless, might as well spend a little extra for high-flow. There are some high-flow cats that can avoid a CEL too.

[carbonfiber1]

I had full downpipes on my F10, and secondary only on my f90. Your will more gains with DP than any other exhaust modification. You will spend about 4k alone for high flow cats. Yes there is a smell sometimes, roll the windows up.