[Mashour]

What's the difference between your catless downpipe that's currently out vs the fat boy downpipe?

[Mike Slowspeed]

MADE MY 2022 BMW M4 EXHAUST EVEN MORE LOUD & INSANE!

[anakratis]

Originally Posted by Mike Slowspeed

MADE MY 2022 BMW M4 EXHAUST EVEN MORE LOUD & INSANE!

Wow that sounds GREAT Mike! Love the random park installs

[Info@mad-us.com]

Originally Posted by Mashour

What's the difference between your catless downpipe that's currently out vs the fat boy downpipe?

We maxed out the Piping diameter to get as much flow as possible.

[G-Breazy]

Just wanted to mention these shipped out and got to my house within 3 days. Super quick delivery was very impressed. From Nevada to Quebec, doesn’t get much further then that haha. Haven’t installed them yet but will update on how the exhaust sounds like, I’m looking forward to enjoying the sound.

[Info@mad-us.com]

Originally Posted by G-Breazy

Just wanted to mention these shipped out and got to my house within 3 days. Super quick delivery was very impressed. From Nevada to Quebec, doesn’t get much further then that haha. Haven’t installed them yet but will update on how the exhaust sounds like, I’m looking forward to enjoying the sound.

Let us know once you install them!

[Game Changer]

any dyno numbers??

[G-Breazy]

Finally installed the catless downpipes and paired it with the vsc valve controller. Car kept getting delayed and I also wanted to do the install only after the break in service.

My car is otherwise completely stock besides the catless downpipes and valve controller.

The sound I was after was OEM ++ (double plus) and this is exactly it. Zero drone. Valves closed and it’s exactly like stock. Not even slightly louder. But open up the valves and hit sport plus and wow amazing. It literally amplifies wtv sound you have stock. Nothing is changed just louder which I like.

What’s great is it’s only loud when you are on the throttle, when you idle it’s just a nice hum, no drone. You also get pops galore on downshifts but not too obnoxious, it’s just right. And when you are coming in hot and downshift to over 6k rpm’s you get the real gunshots not the little burbles. The big pops but only 1 or 2 and that’s it. Just enough to keep you chasing that high over and over haha.

Best part is I kept my secondary cats and absolutely no smell what’s so ever. I legit stick my nose in the exhaust pipe and nothing. This was a big worry for me because I have a pretty sensitive nose.

I must note that the valve controller is a must. I don’t like driving all the time full rpm’s so this way I can still hear the great symphony without having to floor it all the time.

Thanks MAD. Great product at an even greater price. Keep up the good work I’m very impressed!

[Info@mad-us.com]

Originally Posted by G-Breazy

Finally installed the catless downpipes and paired it with the vsc valve controller. Car kept getting delayed and I also wanted to do the install only after the break in service.

My car is otherwise completely stock besides the catless downpipes and valve controller.

The sound I was after was OEM ++ (double plus) and this is exactly it. Zero drone. Valves closed and it’s exactly like stock. Not even slightly louder. But open up the valves and hit sport plus and wow amazing. It literally amplifies wtv sound you have stock. Nothing is changed just louder which I like.

What’s great is it’s only loud when you are on the throttle, when you idle it’s just a nice hum, no drone. You also get pops galore on downshifts but not too obnoxious, it’s just right. And when you are coming in hot and downshift to over 6k rpm’s you get the real gunshots not the little burbles. The big pops but only 1 or 2 and that’s it. Just enough to keep you chasing that high over and over haha.

Best part is I kept my secondary cats and absolutely no smell what’s so ever. I legit stick my nose in the exhaust pipe and nothing. This was a big worry for me because I have a pretty sensitive nose.

I must note that the valve controller is a must. I don’t like driving all the time full rpm’s so this way I can still hear the great symphony without having to floor it all the time.

Thanks MAD. Great product at an even greater price. Keep up the good work I’m very impressed!

Thank you for your positive review and kind words!

[Game Changer]

Originally Posted by G-Breazy

Finally installed the catless downpipes and paired it with the vsc valve controller. Car kept getting delayed and I also wanted to do the install only after the break in service.

My car is otherwise completely stock besides the catless downpipes and valve controller.

The sound I was after was OEM ++ (double plus) and this is exactly it. Zero drone. Valves closed and it’s exactly like stock. Not even slightly louder. But open up the valves and hit sport plus and wow amazing. It literally amplifies wtv sound you have stock. Nothing is changed just louder which I like.

What’s great is it’s only loud when you are on the throttle, when you idle it’s just a nice hum, no drone. You also get pops galore on downshifts but not too obnoxious, it’s just right. And when you are coming in hot and downshift to over 6k rpm’s you get the real gunshots not the little burbles. The big pops but only 1 or 2 and that’s it. Just enough to keep you chasing that high over and over haha.

Best part is I kept my secondary cats and absolutely no smell what’s so ever. I legit stick my nose in the exhaust pipe and nothing. This was a big worry for me because I have a pretty sensitive nose.

I must note that the valve controller is a must. I don’t like driving all the time full rpm’s so this way I can still hear the great symphony without having to floor it all the time.

Thanks MAD. Great product at an even greater price. Keep up the good work I’m very impressed!

Which Mad dps did you purchase...fat boy or regular? Also, how does the valve controller work and tie into the system?

[Nado]

Originally Posted by G-Breazy

Finally installed the catless downpipes and paired it with the vsc valve controller. Car kept getting delayed and I also wanted to do the install only after the break in service.

My car is otherwise completely stock besides the catless downpipes and valve controller.

The sound I was after was OEM ++ (double plus) and this is exactly it. Zero drone. Valves closed and it’s exactly like stock. Not even slightly louder. But open up the valves and hit sport plus and wow amazing. It literally amplifies wtv sound you have stock. Nothing is changed just louder which I like.

What’s great is it’s only loud when you are on the throttle, when you idle it’s just a nice hum, no drone. You also get pops galore on downshifts but not too obnoxious, it’s just right. And when you are coming in hot and downshift to over 6k rpm’s you get the real gunshots not the little burbles. The big pops but only 1 or 2 and that’s it. Just enough to keep you chasing that high over and over haha.

Best part is I kept my secondary cats and absolutely no smell what’s so ever. I legit stick my nose in the exhaust pipe and nothing. This was a big worry for me because I have a pretty sensitive nose.

I must note that the valve controller is a must. I don’t like driving all the time full rpm’s so this way I can still hear the great symphony without having to floor it all the time.

Thanks MAD. Great product at an even greater price. Keep up the good work I’m very impressed!

So catless DP with the stock mid pipe and axle back, thus keeping the stock secondary cats? And you dont get any funky smell yet? How many miles do you have on the setup?

[Laoschris]

Originally Posted by Game Changer

Which Mad dps did you purchase...fat boy or regular? Also, how does the valve controller work and tie into the system?

I'd like to know this as well. Regular or fat boy?

[G-Breazy]

It’s the regular catless ones, I have about 1000kms on it now. I purchased spacers to go with it so no check engine light yet (Hopefully never). No other exhaust modifications besides the valve controller. It’s one of those controllers you plug into the existing cables near the exhaust and then mount the controller under the exhaust. It comes with 2 remotes, I simply leave the remote in the phone charging tray and push button when I start the car and it opens the valves. Makes a huge difference because the OEM valves only open fully above 4500 rpm I believe. For the price and reversibility factor I think catless is the best way to go. No need to chop up your exhaust. I don’t smell anything for those asking, obviously if you cold start it you need to let the secondary cats warm up and it will soak up all the smell. When warm I’ve stuck my nose in the back side of the exhaust and didn’t smell anything. Also at long red lights didn’t smell anything with the window down. Also just to note, with the rest of the exhaust stock, the sound is not raspy at all. It’s literally like OEM but just much louder. And much more pronounced burbles and pops.

[OEM3]

just ordered mine. Can't beat the price right now.

[Impulse20098]

Originally Posted by 1mjustaguy

just ordered mine. Can't beat the price right now.

Ordered mine as well. Price is amazing right now.

[Bguggs]

Info@mad-us.com
With the catted downpipes for S58 the o2 sensor would you recommend straight or 90 ?

Thank you

[Info@mad-us.com]

Originally Posted by Bguggs

Info@mad-us.com
With the catted downpipes for S58 the o2 sensor would you recommend straight or 90 ?

Thank you

I've heard the straight one works.

[SF49ersFaithful]

Hi, Does your MAD downpipes comes with o2 spacers?

[tac3331]

Originally Posted by SF49ersFaithful

Hi, Does your MAD downpipes comes with o2 spacers?

No. Will need two of these
http://www.bigdaddiesgarage.com/mini-cat-cel-fix.html

[G-Breazy]

3000km update:

I put these downpipes on my car the day after break in, and I don’t know if it’s because the exhaust needed some more breaking in, but damn it sounds sooooo much better and louder now after 3000kms (it sounded fantastic before also, don’t get me wrong). I’m getting those Knarly clean super crisp pops so much more now and at lower rpm’s. I can’t even explain it, I’m just so impressed with just catless downpipes and valve controller. Again I must stress valve controller is a must.

I was debating taking it a step further and just cutting out the first resonator, but now I’m not even sure it’s needed. Maybe I’ll do it this summer when I get used to the sound and want a little more.

If it wasn’t for fear of hating the smell, getting rid of the secondary cats would be the way to go next 100%%%.

Im leaving a ton of feedback because before I bought these I was searching the forum endlessly to hear peoples thoughts, so I hope this helps someone decide what direction they want to take.

Also car has just under 5000km and no cel with spacer installed.

[Info@mad-us.com]

Originally Posted by G-Breazy

3000km update:

I put these downpipes on my car the day after break in, and I don’t know if it’s because the exhaust needed some more breaking in, but damn it sounds sooooo much better and louder now after 3000kms (it sounded fantastic before also, don’t get me wrong). I’m getting those Knarly clean super crisp pops so much more now and at lower rpm’s. I can’t even explain it, I’m just so impressed with just catless downpipes and valve controller. Again I must stress valve controller is a must.

I was debating taking it a step further and just cutting out the first resonator, but now I’m not even sure it’s needed. Maybe I’ll do it this summer when I get used to the sound and want a little more.

If it wasn’t for fear of hating the smell, getting rid of the secondary cats would be the way to go next 100%%%.

Im leaving a ton of feedback because before I bought these I was searching the forum endlessly to hear peoples thoughts, so I hope this helps someone decide what direction they want to take.

Also car has just under 5000km and no cel with spacer installed.

Thanks for the update! Maybe a midpipe next?

[cyberazy]

Hi, is anyone able to confirm if they have the same flat section on their decats ?