1.75 OEM Exhaust MOD

[saxodreng]

For those who are thinking about buying an expensive performance exhaust to achieve better sound - an oem exhaust mod could be an easy and cheap way - ofcourse if you believe that 420 hp is enough.....

And cabin sound - no drone at all

[nodemgr]

nice, thanks for the great vids/audio.

[Helmsman]

Whats wrong with the 2 pipe mate, no drone what so ever, could even had a tad more juice!

[saxodreng]

Originally Posted by Helmsman

Whats wrong with the 2 pipe mate, no drone what so ever, could even had a tad more juice!

My dear Swedish Brother....

The Two pipe i just a bit louder - and my goal was to get as close to the MPE sound signature as possible. And the 1.75 is quite close to that.

There is absolutely nothing wrong with the 2-pipe mode - I know that the drone is NOT present there as well.

Do you have the 2-pipe mod, Helmsman ?

[shimmy23]

thanks for posting saxodreng! More options for the OEM mod are always a

[RomanK]

Can you explain what exactly you did with stock muffer? I didn't understand it on video. Thanks.

[saxodreng]

Originally Posted by RomanK

Can you explain what exactly you did with stock muffer? I didn't understand it on video. Thanks.

There is a good explanation in this video - the video shows althoug a 2.5 mod - take a look again in my video where the drawing shows how the 1.75 mod is to be wrapped, but the the overall procedure is the same.

[RomanK]

Thanks for the explanation.

Two more questions.

Did you put all the hairs back inside the muffer?
Did you release from hears small perforated pipes?

[Helmsman]

Originally Posted by saxodreng

My dear Swedish Brother....

The Two pipe i just a bit louder - and my goal was to get as close to the MPE sound signature as possible. And the 1.75 is quite close to that.

There is absolutely nothing wrong with the 2-pipe mode - I know that the drone is NOT present there as well.

Do you have the 2-pipe mod, Helmsman ?

Sorry for being late back broder. Yep, 2 pipe since a couple of years and no regrets!

[saxodreng]

Originally Posted by RomanK

Thanks for the explanation.

Two more questions.

Did you put all the hairs back inside the muffer?
Did you release from hears small perforated pipes?

Yes all "hair" back in

[E90M3_Guy]

Sorry to resurrect this old thread after so many years. Thank you saxondreng for very helpful information. I believe the sound I'm looking for is something less than 2-pipe mod. I've heard of 1.75 or 1.8 pipe before and it's helpful to see how it's done.

My exhaust specialist recommends to weld in new non-perforated pipes rather than wrap because wrap doesn't hold up over time, especially with backfires. So that might make it challenging to do less than a 2 pipe mod. If I go with 1.5 pipe, I'm wondering if the remaining perfs should be nearest the back or in the middle?

[saxodreng]

Originally Posted by E90M3_Guy

Sorry to resurrect this old thread after so many years. Thank you saxondreng for very helpful information. I believe the sound I'm looking for is something less than 2-pipe mod. I've heard of 1.75 or 1.8 pipe before and it's helpful to see how it's done.

My exhaust specialist recommends to weld in new non-perforated pipes rather than wrap because wrap doesn't hold up over time, especially with backfires. So that might make it challenging to do less than a 2 pipe mod. If I go with 1.5 pipe, I'm wondering if the remaining perfs should be nearest the back or in the middle?

The Wrapping method actually allows the "Roll-back" option....

The 1.75 MOD suits me just perfect - these MOD has many names. Me and many others prefer to count the MOD per Chamber. Of course the MOD is done in both chambers - and therefore som call the 2-pipe MOD for a 4 Pipe MOD witch is actually the same.

Whether you do the Wrap-method or swapping the pipes gets you there - but I recommend you to perforate at least a bit of one of the pipes per chamber - just to ensure that you can live with the result. That little bit of perforation just take the top of the resonance - when daily driving. Acceleration sound is almost the same as the complete 2/4-pipe MOD anyway.

[E90M3_Guy]

Thanks for this extra information saxonreng. Some people say a 4 pipe mod is perfect. Others love the 2 pipe. Others enjoy less. I want something mild, therefore I relate to the person who said they found the 2 pipe mod way too loud for a family daily drive. That person changed to 1 pipe - meaning 1/2 the pipe on each side - and love it.

I will settle for something between 1 and 1.5 pipe mod - meaning wrapping or replacing between 50% - 75% of the perfs on each side. I have the luxury of owning a second back section that I bought used. So if I don't like it, I can swap back to stock while I rethink things.

Does it matter in what place along the tube the remaining perforations are left? End or middle?

[akkando]

Originally Posted by E90M3_Guy

Thanks for this extra information saxonreng. Some people say a 4 pipe mod is perfect. Others love the 2 pipe. Others enjoy less. I want something mild, therefore I relate to the person who said they found the 2 pipe mod way too loud for a family daily drive. That person changed to 1 pipe - meaning 1/2 the pipe on each side - and love it.

I will settle for something between 1 and 1.5 pipe mod - meaning wrapping or replacing between 50% - 75% of the perfs on each side. I have the luxury of owning a second back section that I bought used. So if I don't like it, I can swap back to stock while I rethink things.

Does it matter in what place along the tube the remaining perforations are left? End or middle?

I don't get it. With the windows up driving normally with 2 pipe the car sounds like anything else on the road.

[E90M3_Guy]

Originally Posted by akkando

I don't get it. With the windows up driving normally with 2 pipe the car sounds like anything else on the road.

Thanks for the feedback

[akkando]

Originally Posted by E90M3_Guy

Thanks for the feedback

I guess it's worth noting the cold start is louder which can't be avoided "with the family" unless you get a tune to code out the cold start routine.

[saxodreng]

Originally Posted by akkando

I don't get it. With the windows up driving normally with 2 pipe the car sounds like anything else on the road.

The sound note between the 1.5 / 1.75 and the full 2-pipe MOD is almost the same when driving normal. The difference only come out when hard accelerating above 4000 RPM.

I think it is cool to have a car that can blend in and not shouting all the time....

[E90M3_Guy]

Originally Posted by saxodreng

The sound note between the 1.5 / 1.75 and the full 2-pipe MOD is almost the same when driving normal. The difference only come out when hard accelerating above 4000 RPM.

I think it is cool to have a car that can blend in and not shouting all the time....

What would be really cool would be to have a length of solid pipe that could slide back and forwards to cover or uncover the perforations. If this could be electrically operated, it would be a new version of a valved exhaust! Hahaha

[akkando]

Originally Posted by E90M3_Guy

What would be really cool would be to have a length of solid pipe that could slide back and forwards to cover or uncover the perforations. If this could be electrically operated, it would be a new version of a valved exhaust! Hahaha

Now that would be cool!

[serranot]

I am a "hate obnoxious loud exhaust" person and have the 2-pipe mod. It is not loud. Not even close. I can't imagine someone saying the 2-pipe is too loud, but I know this is an individual taste.