E90 M3 w/ 4 Pipe OEM Mod + Secondary Cat Delete

[BRNDNSLVRA]

Check it out:

[Skhan109]

Originally Posted by 954MM

Check it out:

Sounds good

[akkando]

Why is there music in the background for an exhaust video?

[mapster37]

sounds good. who did the exhaust mod? im in 954 too

[Skhan109]

What did you notice with 4 pipe mod vs 4 pipe mod with secondary cat delete (if you didn't do it simultaneously)?

[BRNDNSLVRA]

Originally Posted by akkando

Why is there music in the background for an exhaust video?

Because I decided to add it? Im sure its not louder than the exhaust so idk why youre complaining.

Originally Posted by mapster37

sounds good. who did the exhaust mod? im in 954 too

Meister Motoring in Ft Lauderdale!

Originally Posted by Skhan109

What did you notice with 4 pipe mod vs 4 pipe mod with secondary cat delete (if you didn't do it simultaneously)?

I didnt do it simultaneously. I lived with just the 4 pipe mod for 6 months.

Definitely a deeper tone. Id say its like, 35% louder. Maybe more. No drone whatsoever. It sounds amazing.

[simpleM3]

Sounds nice. Anyone know if the cat delete has been done to the perforated (two-pipe) pipe mod?

[simpleM3]

[QUOTE=954MM;25996846]Check it out:

any downside to the 2ndry cat delete? At the minimum I'd assume issues with emissions which isn't an issue in FL seeing as that you guys aren't required to have that done.

[Skhan109]

[QUOTE=simpleM3;26005657]

Originally Posted by 954MM

Check it out:

any downside to the 2ndry cat delete? At the minimum I'd assume issues with emissions which isn't an issue in FL seeing as that you guys aren't required to have that done.

Secondary cat delete won't throw off any CEL

[DL335D]

Originally Posted by 954MM

Check it out:

Sounds amazing. For your vid you only replaced the 4 perforated pipes with straight pipes? Nothing else?

[BRNDNSLVRA]

Originally Posted by DL335D

Sounds amazing. For your vid you only replaced the 4 perforated pipes with straight pipes? Nothing else?

Yup! That's it as far as the muffler

[Blindside_137]

It's freaking glorious man. I have the regular OEM mod and love it, but some more volume would be nice. Might do this over the summer.

[DL335D]

What's the "regular" OEM mod? I'm new to this stuff.

[amrazM]

4 pipe mod is basically a muffler delete no?


your deleting all the perforated sections within the muffler, why not just delete the muffler and save the weight

[GtiGyver]

Is it just me or did he just use a freeze frame after ~6 seconds?

[DL335D]

Originally Posted by amrazM

4 pipe mod is basically a muffler delete no?


your deleting all the perforated sections within the muffler, why not just delete the muffler and save the weight

I thought the 4 pipe mod was covering all 4 middle perforated pipes with solid pipes and removing the dog hair. No? This is what the OP did.

2 pipe mod is replacing the 2 large middle pipes with straight pipes.

ACM is basically straight pipes through the exhaust which helps it drone less than straight pipes I guess. I think this is a little louder than the 4 pipe mod. I'm probably wrong.

[akkando]

Originally Posted by DL335D

I thought the 4 pipe mod was covering all 4 middle perforated pipes with solid pipes and removing the dog hair. No? This is what the OP did.

2 pipe mod is replacing the 2 large middle pipes with straight pipes.


ACM is basically straight pipes through the exhaust which helps it drone less than straight pipes I guess. I think this is a little louder than the 4 pipe mod. I'm probably wrong.

reply was mostly meant for amraz

Nah the dog hair insulation stuff is normally kept.

you got 2 pipe where the two larger perforated pipes are replaced with solid pipes.

2.5 where a third smaller perforated pipe is I think half replaced with solid or half wrapped with material that covers the holes.

You could do other varieties I guess replacing half of the large pipes but I don't know of a name for something like that.

4 pipe replaces all 4 perforated pipes with solid in the center chambers. I understand the muffler design still reduces drone this way.

ACM method which just bypasses the criss crossing of pipes in the center muffler and comes straight out so no pipes are going through the center where the "dog hair" is. This is going to have the most drone.

[E92_Emma3]

Originally Posted by 954MM

Check it out:

This sounds amazing! I have the oem exhaust mod and want to get to this sound. When you remove the secondary cats do you have to add a straight pipe? Don't know how this stuff works. Also would any muffler shop be able to remove the secondary cats? What do I ask them to do? Lol

[Skhan109]

Originally Posted by E92_Emma3

This sounds amazing! I have the oem exhaust mod and want to get to this sound. When you remove the secondary cats do you have to add a straight pipe? Don't know how this stuff works. Also would any muffler shop be able to remove the secondary cats? What do I ask them to do? Lol

Any muffler shop should be able to do it. Personally keep the secondary and remove the primary. The smell will be a lot less and the sound is louder. Will need to tune to remove the CEL.

[E92_Emma3]

Originally Posted by Skhan109

Any muffler shop should be able to do it. Personally keep the secondary and remove the primary. The smell will be a lot less and the sound is louder. Will need to tune to remove the CEL.

I'm just trying to get a little bit more of a sound without compromising CEL or getting a tune, so thinking about doing this especially if it sounds even a little like yours.

[Skhan109]

Originally Posted by E92_Emma3

I'm just trying to get a little bit more of a sound without compromising CEL or getting a tune, so thinking about doing this especially if it sounds even a little like yours.

Then yes you will get a deeper growl if you remove it. Go for it !!

[E92_Emma3]

Originally Posted by Skhan109

Then yes you will get a deeper growl if you remove it. Go for it !!

Awesome, thanks for the quick response!