[binarycars]

Hey All,

I have installed the AA Catted DP and Dinan CAI, it sounds great overall but still just a tad too quiet for my taste after having a 2020 Supra before this. I took a photo of the underside while it was lifted and in the US there's nothing between the DP and the Muffler.

Has anyone in Arizona or California ever done a custom valved exhaust? What would be the cost of something like that? I have seen what is being done in the UK but I don't think I'd ship an exhaust from there (especially if it's OPF back).

[ryo-]

is there no secondary cat on this car?

[binarycars]

I guess only countries that require OPF like the UK have OPF in the mid section

[Rdurty2]

All you can really do is go straight pipe which will be insanely loud and sounds like garbage, or put in a different muffler.

If bmw comes out with an M perf exhaust it will just be a different muffler.

[Brett_C_F30_G42]

So pretty sure there are two twin resonators right under that plate in the middle. If there are then you can do a resonator delete and put in an X-pipe or H-pipe. If there aren't, you can just do the X-pipe or H-pipe. Should give some throatiness to it without sacrificing too much. Plus pretty sure its legal.

[mike@x-ph.com]

Get a catless downpipe for now or wait for a proven company to release their exhausts.

In my opinion, local exhausts in most cases do not sound nearly as good as the proven companies that did their R&D

[mblaucoupe135]

Excuse my ignorance but can you do a midpipe on this car? Had a Dinan one on my f22 with the m performance exhaust and it sounded amazing!!!

[Brett_C_F30_G42]

You should be able to. BMW manufactures most of their models now with resonators so do a resonator delete and then add an x-pipe or h-pipe as extra If you want throatiness.

[Rdurty2]

Originally Posted by Brett_C_F30_G42

You should be able to. BMW manufactures most of their models now with resonators so do a resonator delete and then add an x-pipe or h-pipe as extra If you want throatiness.

But are those actually resonators by the cross brace? It’s hard to tell from that photo, it looks like the piping may be a little bulged out which could indicate resonators but it could just be a misleading angle.

I always thought the M models, including M lights, didn’t have resonators.

The resonators on my 340 were insanely obvious and stuck out like a sore thumb which is making me think those are not resonators in the above pic.

[Brett_C_F30_G42]

Originally Posted by Rdurty2

But are those actually resonators by the cross brace? It’s hard to tell from that photo, it looks like the piping may be a little bulged out which could indicate resonators but it could just be a misleading angle.

I always thought the M models, including M lights, didn’t have resonators.

They should be resonators. If you look at the photo you can see the welding starts and ends before and after the "bulge." But even if there aren't any resonators there, an X-pipe or H-pipe should make the exhaust note throatier.

[binarycars]

I assumed the welds are just where the OPF are for the UK, if you watch the auto id video on YouTube that's where they are. Why would an H pipe change the sound if we are coming from a single downpipe? Twin turbo M models have two downpipes and changing how the sound overlaps can change the exhaust note.

[Brett_C_F30_G42]

Originally Posted by binarycars

I assumed the welds are just where the OPF are for the UK, if you watch the auto id video on YouTube that's where they are. Why would an H pipe change the sound if we are coming from a single downpipe? Twin turbo M models have two downpipes and changing how the sound overlaps can change the exhaust note.

Well until someone looks underneath the car again we don't know if there are resonators or not :. The H-pipe should still change it a bit because of its 90° turn. Pressure and back force and changed as a result of it and so the exhaust sound note will be different

[marcsg42]

The exhaust looks pretty good ,good as in not much restrictions, most cars that you x pipe or h pipe is because there are 2 separate pipes coming off the head of the motor, in are case its one bigger one then splits off I don’t see the benefits of the x pipe seems pointless in this case,maybe if you x pipe it closer to the muffler it would change the exhaust note a little,but if you x pipe it right where it splits now I don’t see it doing much

[Brett_C_F30_G42]

Originally Posted by marcsg42

The exhaust looks pretty good ,good as in not much restrictions, most cars that you x pipe or h pipe is because there are 2 separate pipes coming off the head of the motor, in are case its one bigger one then splits off I don’t see the benefits of the x pipe seems pointless in this case,maybe if you x pipe it closer to the muffler it would change the exhaust note a little,but if you x pipe it right where it splits now I don’t see it doing much

Someone needs to try it

[ronin_pdx]

I wounder if the hks exhaust would work

[Rdurty2]

Originally Posted by Brett_C_F30_G42

Well until someone looks underneath the car again we don't know if there are resonators or not :. The H-pipe should still change it a bit because of its 90° turn. Pressure and back force and changed as a result of it and so the exhaust sound note will be different

Someone made a custom exhaust where they just removed the muffler and put piping in it’s place. They verified that there is in fact no resonators or anything on the stock exhaust. After the downpipe/cat it’s just straight pipe until the single rear muffler.

[OC335sedan]

For those saying a muffler delete on B58 cars sounds bad or too loud, you clearly haven’t tried it. I’ve had it done by a quality local muffler shop in SoCal on my last 6 BMWs, including N55 M235’s, a 2018 N55 M2, and two B58 M240’s (including my current 2019 M240). All have been daily drivers, all have sounded amazing, and all have had very minimal drone. I’ve deleted the resonator (in addition to the muffler) on some and left it in place on others. Res makes about an extra 10-20% difference in volume.

Muffler deletes on naturally aspirated cars for sure sound bad and too loud…but on turbo-6 BMWs sound great. The turbo and downpipe are acting as additional mufflers.

I’ve literally removed MPE exhausts and sold them to replace with muffler deletes, and everyone that has heard my car before and after preferred the sound on the delete.

[tubingchamp]

Originally Posted by OC335sedan

For those saying a muffler delete on B58 cars sounds bad or too loud, you clearly haven’t tried it. I’ve had it done by a quality local muffler shop in SoCal on my last 6 BMWs, including N55 M235’s, a 2018 N55 M2, and two B58 M240’s (including my current 2019 M240). All have been daily drivers, all have sounded amazing, and all have had very minimal drone. I’ve deleted the resonator (in addition to the muffler) on some and left it in place on others. Res makes about an extra 10-20% difference in volume.

Muffler deletes on naturally aspirated cars for sure sound bad and too loud…but on turbo-6 BMWs sound great. The turbo and downpipe are acting as additional mufflers.

I’ve literally removed MPE exhausts and sold them to replace with muffler deletes, and everyone that has heard my car before and after preferred the sound on the delete.

From what I've heard in videos - I much prefer muffler delete to a downpipe.. IMO, the downpipe sounds a bit raspy, and adds a "diesel-esque" tone to the lower RPM range.

I just have not heard either in person. A bit scary to pull the trigger on a brand new car without knowing!

[Value]

Originally Posted by tubingchamp

From what I've heard in videos - I much prefer muffler delete to a downpipe.. IMO, the downpipe sounds a bit raspy, and adds a "diesel-esque" tone to the lower RPM range.

I just have not heard either in person. A bit scary to pull the trigger on a brand new car without knowing!

A downpipe is bought to make more power,it should never be bought for sound only. Yes it adds more volume,but it’s still not the same thing. If you just want the car to be louder and don’t care about performance,Buy an exhaust….

[tubingchamp]

Originally Posted by Value

A downpipe is bought to make more power,it should never be bought for sound only. Yes it adds more volume,but it’s still not the same thing. If you just want the car to be louder and don’t care about performance,Buy an exhaust….

Ideally both, but at the same time - I daily drive my car.. Also live in a townhouse, so don't want to bother my neighbors with volume.

Also, I don't really enjoy raspy exhaust notes. I like deeper smooth tones, but with a bit more noise.

I am definitely not knocking downpipes. For my particular preferences, the performance gain is not worth the sound they emit.

[Value]

Originally Posted by tubingchamp

Ideally both, but at the same time - I daily drive my car.. Also live in a townhouse, so don't want to bother my neighbors with volume.

Also, I don't really enjoy raspy exhaust notes. I like deeper smooth tones, but with a bit more noise.

I am definitely not knocking downpipes. For my particular preferences, the performance gain is not worth the sound they emit.

I daily all my cars as well,that’s why I usually buy an exhaust with 2 valves. Even with a catless downpipe it sounds more quite then stock. But in general,a good catted downpipe will not be raspy. You are thinking of a catless.

I know you aren’t,Just putting it out there..

[MarkDoronin]

a lot of opinions, but what did the topic author decide?
I would like to see options here