Equal-length exhaust discussion: new S55 sounds

[Kilabyte]

Originally Posted by RMDZidane

I'm looking forward to hearing it

Me too....on my own car

[Ed_rx7]

Probably somewhere but does anyone have clips of an MPE with magnaflow resonators in place of the secondary cats?

[Lifestyler]

So now we build H after the equal lenght and delate midresonator (was X pipe inside before) full 3"

Paired with MPE

[remixaflip]

Originally Posted by Lifestyler

So now we build H after the equal lenght and delate midresonator (was X pipe inside before) full 3"

Compared with MPE

Sound Clips? Interested to see how this sounds!

[Lifestyler]

Sounds not that good, way to loud and screaming imo.

We add some resonators and maybe go back to x pipe or make the "equal lenght" part longer.

Will see soon.

[ntg44]

Originally Posted by Lifestyler

Sounds not that good, way to loud and screaming imo.

We add some resonators and maybe go back to x pipe or make the "equal lenght" part longer.

Will see soon.

Since you're redoing it anyways, it would be worth your time to measure from downpipe connection to H pipe on the driver's side with string, then measure the passenger side with the U bend. The U bend side should be 14 inches longer, or close to it. I had a feeling it wouldn't turn out well, your U bend looks smaller than I expected.

[spool twice]

Space out the bend another 1-1.5" (or whatever that converts to in metric) before replacing the H-pipe with an x-pipe to see if that corrects the sound.

[Lifestyler]

Yes we will add about 4 inch into the U bent soon.

[spool twice]

Just to also clarify, you don't have the OE center resonator on there right? With the H-pipe section built into it?

[doughboy]

Originally Posted by Lifestyler

Yes we will add about 4 inch into the U bent soon.

Remember, the u-bend needs to ADD 14" to the pipe length, that means the ubend assembly will be much longer than 14", more like 22" if it replaces 8" of straight pipe.

Don't just make a 14" ubend that will be to short.

[ntg44]

Originally Posted by doughboy

Remember, the u-bend needs to ADD 14" to the pipe length, that means the ubend assembly will be much longer than 14", more like 22" if it replaces 8" of straight pipe.

Don't just make a 14" ubend that will be to short.

Which is why I suggested measuring from the downpipe connection to the H pipe with string That's what Top Gear did, and well, you hear how glorious it sounds haha.

[doughboy]

We're going to use specially calibrated string to measure mine...

That will make it sound even better

[Lifestyler]

Originally Posted by ntg44

Which is why I suggested measuring from the downpipe connection to the H pipe with string That's what Top Gear did, and well, you hear how glorious it sounds haha.

Where the latest sound video of urs?

[ntg44]

Originally Posted by Lifestyler

Where the latest sound video of urs?

For my custom system, check Post #3 of this thread. V2 is the most current.

For the upcoming Top Gear system, still waiting patiently

I hope I have something meaningful to share with everyone by end of day today. I'm trying my best not to spam bump this thread if I have nothing of substance to share.

[Kilabyte]

I'm just hoping that when open it's not quieter than my MPE

[ntg44]

Originally Posted by Kilabyte

I'm just hoping that when open it's not quieter than my MPE

Won't know for sure until it's done, but titanium has its own acoustic properties that make it louder than stainless steel. One thing I know for sure is TG system will be SS. But anything with a muffler bypass valve is going to be loud.

[Ed_rx7]

Will they be offering just a midpipe?

[ntg44]

Originally Posted by Ed_rx7

Will they be offering just a midpipe?

The design of the exhaust which gives it the unique tone makes mating to any of the existing mufflers out there impossible.

[Kilabyte]

Originally Posted by ntg44

Won't know for sure until it's done, but titanium has its own acoustic properties that make it louder than stainless steel. One thing I know for sure is TG system will be SS. But anything with a muffler bypass valve is going to be loud.

I have no issues with the material, I'm simply used to the loudness with the valves closed and open

[Ed_rx7]

Originally Posted by ntg44

The design of the exhaust which gives it the unique tone makes mating to any of the existing mufflers out there impossible.

Boooooo...... AA midpipe it is then😂

[calebcross]

I just read through this entire thread and now I want to equal-length my AWE Track Edition exhaust for my M4. That would be insane.

I assume everything would work the same– just make sure the passenger side is 14 inches longer from the downpipe than the driver side and then merge with H or X-Pipe right after that?

[ntg44]

Originally Posted by calebcross

I just read through this entire thread and now I want to equal-length my AWE Track Edition exhaust for my M4. That would be insane.

I assume everything would work the same– just make sure the passenger side is 14 inches longer from the downpipe than the driver side and then merge with H or X-Pipe right after that?

Yep. Just need to delete the x pipe at the beginning of the system in addition to the above changes and you're good to go.