New MAD Product Release- MAD BMW S55 3.5" FAT BOY DOWNPIPES M2C M3 M4

[Info@mad-us.com]

Originally Posted by deli333

My mechanic fitted it last week. Seems like no problem but he swore at me saying i find the tigthest shit all the time. Anyways, thanks to him he is a legend.

The sound is awesome, I think I have found one of the best combos in this platform.

MPE Backbox, single mid pipe with 2x resonators just after the diff towards muffler and fat boi 3.5 downpipes. no rattle, drone or rasp. Before this I had arm resonated downpipes and in general it was a bit quiet. it is just a bit louder but with 0 rasp and really deeper sound overall. to a point sometimes it is a bit like v8 growl in low rpms (i drive my friend' c63 sometimes)

i'll try to record it sometime and post it

Not called the Fatboy for nothing ! 🤣

[deli333]

https://streamable.com/v4q80f

[Info@mad-us.com]

Originally Posted by deli333

https://streamable.com/v4q80f

Sounds good

[Marioec]

Any sound clips or Dyno numbers ? the links don't work

[Danlnyc88]

Kinda curious myself is there any noticeable difference between these and any other 3" DPs?

[Motown65]

Originally Posted by Danlnyc88

Kinda curious myself is there any noticeable difference between these and any other 3" DPs?

performance i highly doubt it since they all still taper to 2.5 for the midpipe. We need a company to do a true dual 3in full exhaust

[FrankMstein]

It will not gain any HP/TQ. Just sounds a little deeper than stock at start and drive. Spools it a little faster. Well worth it. My "link" with the base exhaust on page 2 works.

[Info@mad-us.com]

Originally Posted by FrankMstein

It will not gain any HP/TQ. Just sounds a little deeper than stock at start and drive. Spools it a little faster. Well worth it. My "link" with the base exhaust on page 2 works.

[heitzke]

I have the downpipes and have been super happy with the tone, but I have the tiniest bit of vibration from them when the car is warming up. It's like the first 1-2min of a drive they vibrate against something but haven't been able to tell what it is yet.

I have to do an 02 sensor this weekend anyway so I'll take a fresh look but wasn't sure if anyone else has had vibrations as well.

[FrankMstein]

[QUOTE=heitzke;30080490]I have the downpipes and have been super happy with the tone, but I have the tiniest bit of vibration from them when the car is warming up. It's like the first 1-2min of a drive they vibrate against something but haven't been able to tell what it is yet.

I have to do an 02 sensor this weekend anyway so I'll take a fresh look but wasn't sure if anyone else has had vibrations as well.[/QUOTE

Have you seen my pictures earlier of what could be rattling? It is fixable but MAD should rotate the O2 bung.

[heitzke]

Originally Posted by FrankMstein

Have you seen my pictures earlier of what could be rattling? It is fixable but MAD should rotate the O2 bung.

Yeah I did, thanks for posting those. That gives me a few spots to check - could be that front hanger against that bracket. I'll post up some pics too when I get underneath this weekend

[FrankMstein]

What was making noise for me was the mid pipe hanger in the video but what could be making a vibrating or rattling noise is the O2 sensor against the underside. Once things heat up and expand, it might move away and quit making noise. MAD needs to move the O2 around the pipe.

[AmuroRay]

Originally Posted by FrankMstein

It will not gain any HP/TQ. Just sounds a little deeper than stock at start and drive. Spools it a little faster. Well worth it. My "link" with the base exhaust on page 2 works.

The faster spool would imply more power.

[FrankMstein]

Originally Posted by AmuroRay

The faster spool would imply more power.

Please prove an implication is proof.

[CRNSYRP]

Anyone have sound clips of these downpipes matched with AA cat-less single mid and Remus Muffler?

[AmuroRay]

Originally Posted by FrankMstein

Please prove an implication is proof.

Explain how you have a faster spool (which is an indicator of less restriction and more flow) without a power gain?

[heitzke]

Faster spool would suggest a slightly different power curve, so technically more power somewhere within the curve but unsure how that would net out in peak power. Hypothetically of course, I swapped to faster spooling turbos at the same time as using these downpipes, so I can't really speak to the spool.

Either way, coming back in as I believe I found the source of the vibration and it was due to the hanger clearance on my VRSF mid and NOT because of these downpipes hitting something. The downpipes must have just angled my mid every so slightly differently and the clearance between the hanger is already pretty tight. I made some slight adjustments and fashioned a little rubber insulator.

[AmuroRay]

Originally Posted by heitzke

Faster spool would suggest a slightly different power curve, so technically more power somewhere within the curve but unsure how that would net out in peak power. Hypothetically of course, I swapped to faster spooling turbos at the same time as using these downpipes, so I can't really speak to the spool.

Either way, coming back in as I believe I found the source of the vibration and it was due to the hanger clearance on my VRSF mid and NOT because of these downpipes hitting something. The downpipes must have just angled my mid every so slightly differently and the clearance between the hanger is already pretty tight. I made some slight adjustments and fashioned a little rubber insulator.

If it’s spooling faster, that means your boost is increasing and Thus power. The only “shift“ that’s occurring is you making power earlier (and this assumes a WOT pull from a dead stop) it wouldn’t change where peak power would be made:

[heitzke]

Originally Posted by AmuroRay

If it’s spooling faster, that means your boost is increasing and Thus power. The only “shift“ that’s occurring is you making power earlier (and this assumes a WOT pull from a dead stop) it wouldn’t change where peak power would be made:

Right, i think we're saying the same thing

[Info@mad-us.com]

Originally Posted by heitzke

Right, i think we're saying the same thing

Quicker Spool will result is more power at the bottom of the curve and a less lag from a roll.

[FrankMstein]

Originally Posted by Info@mad-us.com

Quicker Spool will result is more power at the bottom of the curve and a less lag from a roll.

Yes, the power in the 3500 range is improved. Most people want to quote peak. The pipes did help in the lower range but not in the peak/top end. I have the charts.

[AmuroRay]

Originally Posted by FrankMstein

Yes, the power in the 3500 range is improved. Most people want to quote peak. The pipes did help in the lower range but not in the peak/top end. I have the charts.

I’d be happy to see them, do you have any logs as well?