[madmedman]

Originally Posted by q77

I want to make exactly the same exhaust modifications as you do. Sounds great. Too bad the catless downpipe void the warranty.


Maybe someone from the UK will be interested, he deals with exhaust modifications and made some G80 / 82

https://www.instagram.com/pcw_exhaustmods/

Used him. He is great at exhaust mods. Transformed my M4. However, he is extremely busy and looks like he is booked until December. Should have removed secondary cats as well when I was there. Now have to wait

[Pantagathus]

Has anyone seen what Valvetronic has actually done with their mid pipe? They're charging $1,890 for it and aren't actually saying what it is (I assume so people don't just copy). I assume it's just a secondary and resonator delete, but I haven't seen any underside pics. Seems pricey to take a punt on.

Separately- anyone have much experience with probability of failing the visual inspection in Cali with a secondary delete? OBDII will be fine, and would be surprised at how much smog techs actually know or care to look for secondaries, but interested in real world experience.

[RugbyBro]

Originally Posted by Pantagathus

Has anyone seen what Valvetronic has actually done with their mid pipe? They're charging $1,890 for it and aren't actually saying what it is (I assume so people don't just copy). I assume it's just a secondary and resonator delete, but I haven't seen any underside pics. Seems pricey to take a punt on.

Separately- anyone have much experience with probability of failing the visual inspection in Cali with a secondary delete? OBDII will be fine, and would be surprised at how much smog techs actually know or care to look for secondaries, but interested in real world experience.

Valvetronic has seemingly equalized the pipe lengths then merged them at the point of equalization - hence the more traditional 6-cylinder sound vs standard S58 which sound more like S55. It is likely more involved than deleting resonators. That said, a few people on the F8X side have not had a good experience with them so I wouldn't hold my breath for their product.

With regard to CA, you won't have to SMOG for ages so it won't be an issue for you. By the time G8X is required to be SMOG'd there are likely going to be different procedures in place. As it stands now, you'd pass a computer scan without secondary cats but you'll likely fail a visual.

[TrentMeister]

Originally Posted by Pantagathus

Has anyone seen what Valvetronic has actually done with their mid pipe? They're charging $1,890 for it and aren't actually saying what it is (I assume so people don't just copy). I assume it's just a secondary and resonator delete, but I haven't seen any underside pics. Seems pricey to take a punt on.

Separately- anyone have much experience with probability of failing the visual inspection in Cali with a secondary delete? OBDII will be fine, and would be surprised at how much smog techs actually know or care to look for secondaries, but interested in real world experience.

You don't have to smog these cars until 2029 so it's a non issue really

[Patton250]

Originally Posted by brooklyng80

Secondary cats and both resonators deleted w/ H-pipe.

I know you can still control the valves however does it make a significant difference in how loud the exhaust is? That would be so cool if it did.

I would really like to get this done to my G80. There’s a company called psi as some of you know in Orlando that will do it however communicating with them is next to impossible it seems.

[warcity]

Originally Posted by Patton250

I know you can still control the valves however does it make a significant difference in how loud the exhaust is? That would be so cool if it did.

I would really like to get this done to my G80. There’s a company called psi as some of you know in Orlando that will do it however communicating with them is next to impossible it seems.

Barely noticeable when you use the button to turn the valve on and off at least with my no secondary cat no primary res setup.

[Pantagathus]

Originally Posted by warcity

Barely noticeable when you use the button to turn the valve on and off at least with my no secondary cat no primary res setup.

So you did secondary cat and front res delete and kept rear res? I'm also interested in this so you can maintain the built in x-pipe in the second res. You happy with the result?

[brooklyng80]

Originally Posted by Patton250

I know you can still control the valves however does it make a significant difference in how loud the exhaust is? That would be so cool if it did.

I would really like to get this done to my G80. There’s a company called psi as some of you know in Orlando that will do it however communicating with them is next to impossible it seems.

I've noticed in efficient mode the car sounds a bit louder than stock, but in sport and sport+ there's a significant difference in loudness and amount of cracks/burbles.

[TrentMeister]

Originally Posted by Pantagathus

So you did secondary cat and front res delete and kept rear res? I'm also interested in this so you can maintain the built in x-pipe in the second res. You happy with the result?

Please do this and report back

[warcity]

Originally Posted by LBbluem2

Please do this and report back

Yup. Exactly what I did. Really happy.

[TrentMeister]

Originally Posted by warcity

Yup. Exactly what I did. Really happy.

Oh I though you just did the both resonators and straight pipes, you got videos?

[warcity]

Originally Posted by LBbluem2

Oh I though you just did the both resonators and straight pipes, you got videos?

Working on a vid. Just did secondary cat and primary res. Saving secondary res for later incase I want more sound.

[G80BSM]

Originally Posted by warcity

Working on a vid. Just did secondary cat and primary res. Saving secondary res for later incase I want more sound.

Where are you located in the GTA? I am thinking about doing the same and I would really appreciate if we can meet up sometime to hear your setup.
Cheers!

[warcity]

Originally Posted by G80BSM

Where are you located in the GTA? I am thinking about doing the same and I would really appreciate if we can meet up sometime to hear your setup.
Cheers!

Sure thing. I'm by Yonge and Centre.

[luico1188]

Secondary Cat, both res delete straight pipe. Had to plug the valves back up as it was obnoxiously loud. Still sounds a bit too raspy. Will add secondary Res back on. Here’s a quick sound clip.

[warcity]

And here is my sound clip:

- Sports plus mode
- Secondary cat delete
- Primary Res deleted
- Secondary res NOT deleted

https://www.dropbox.com/s/zbl0n18mx0...%2026.mov?dl=0

[PLife]

Secondary res removal sounds ok till you hear it back on. Much smoother tone. However id wager airbox mods kick it up a notch and will add turbo whistle

[Der_Wolf]

Originally Posted by PLife

Secondary res removal sounds ok till you hear it back on. Much smoother tone. However id wager airbox mods kick it up a notch and will add turbo whistle

What do you mean "until you hear it back on?"

[Der_Wolf]

Originally Posted by luico1188

Secondary Cat, both res delete straight pipe. Had to plug the valves back up as it was obnoxiously loud. Still sounds a bit too raspy. Will add secondary Res back on. Here’s a quick sound clip.

Its odd that it sounds more raspy than when both res are removed with an x-pipe. X pipe should give more rasp than a straight pipe.

[McLaren720s]

So what's the general consensus for best sound?

Remove both resonators?

Or

Remove secondary cats and primary resonator?

[PLife]

Originally Posted by Der_Wolf

What do you mean "until you hear it back on?"

Sorry i meant the instagram video sounds good but the pitch sounded even better to my ears in the dropbox vid immediately after it.

[mattburks]

Originally Posted by McLaren720s

So what's the general consensus for best sound?

Remove both resonators?

Or

Remove secondary cats and primary resonator?

McLaren720s you found a good thread!

I can share my 1 month experience. Went dual resonator, with x pipe. Overall very modest. Sounds nice in sport plus with just the right amount of chatter (burbles etc) — also fun under cold start when valves are open ��
When compared to the H pipe I’ve heard in videos, I can’t tell much of a difference. It would be awesome to see/hear the set ups side by side.

I was very close to returning to pull secondary cat, but have decided this is just right for me at this time with what options are available.