[Dingers]

Hey guys,

I was wondering what the comparison between BMRs own stainless DPs and the AR Design were.

They look very similar, and I've heard say they're essentially the same with the difference being the BMR pipes are cheaper.

Thoughts? Are the BMR pipes a suitable replacement over spending more for the AR Design?

I'm more interested in sound than I am gaining a few kw.

[Ivahnn]

I have the Ar pipes on my n55 and sounds similar to

[rapharm]

Basically just a 3" pipe, should be much of a muchness from my understanding, although the AR design look better and have the option of ceramic coating.

Also keep in mind the install cost

[Dingers]

As long as the BMR pipes sound as good as AR Design I'm sold.

Has anyone heard the BMR pipes and can comment?

P.S. These would be for an N54.

[Digitalism]

They should all sound roughly the same, there just downpipes.

[donR]

Yeah, I agree with the above, they are just an empty pipe. If you are getting catted ones then might sound a bit different.

[Socket]

+1 to just being pipes....

[e36mmm]

Socket I want to buy one soon.. im leaning towards ar design. Catted or catless? Not sure which is better for performance.. why would people choose catted over catless?

[CYL]

I thought the whole propose people changing dp is to make it catless? So that air flow better, turbo spool faster and louder sound?
I also want to know the logic behind changing a stock DP to an aftermarket catted dp.

[JD75]

Originally Posted by e36mmm

Socket I want to buy one soon.. im leaning towards ar design. Catted or catless? Not sure which is better for performance.. why would people choose catted over catless?

Catless is far better for performance than even the best high-flow catted DP.

A true 3" DP goes a long way to significantly reducing the exhaust gas back-pressure that the turbine wheel sees, the choke point of the OEM turbochargers is the relatively small turbine housing, a catless DP will allow for maximum exhaust gas scavenging from the engine before the turbine wheel and housing itself become the limitation.

Only go high-flow catted if you want to stay on the right side of the boys in Blue, the catalytic converters are there for a reason but it's not for a performance benefit.

The ar' design catless are the best manufactured N54 DP on the market, but BMR and VRSF v2's are significantly cheaper and will offer the same results albeit at reduced sex appeal when compared side by side.

Oh and yeah ALL true 3" DP's should provide the same aural pleasure.

[Mayuri Krab]

Originally Posted by CYL

I thought the whole propose people changing dp is to make it catless? So that air flow better, turbo spool faster and louder sound?
I also want to know the logic behind changing a stock DP to an aftermarket catted dp.

There's always the saying on forums that if you are caught without cats then it could be up to $10k in fines for messing with emissions, however I've never seen or heard anyone personal getting done that much.

Plus the above only really applies back in my skyline days, you will get cop attention and much higher chance of getting defected.

Bmw in comparison don't have the same 'hoon image' to it, so I wouldn't worry too much unless your car was riced fast and furious style.

[7smurfs]

Originally Posted by Mayuri Krab

There's always the saying on forums that if you are caught without cats then it could be up to $10k in fines for messing with emissions, however I've never seen or heard anyone personal getting done that much.

Hahaha I've heard that same 'story' since the early JDM days which is many years now!

[iliketurtl3s]

There are secondary cats in the 335.

[bradsm87]

If you still have secondary cats, I'd say you have exactly zero chance of issues with po-po. They can stick their head under the car and see cats. You can't really see the downpipes at all.

I bought Wagner Tuning because they have flex sections, I like the smooth openings to the turbo v-bands, they're 2.75" and they fit perfectly. Twin 2.75" pipes have the same area as a single 4" pipe which is huge so anyone who thinks there is a power difference between 2.75" and 3" under 450rwkw is kidding themselves IMO.

[e36mmm]

Originally Posted by JD75

Catless is far better for performance than even the best high-flow catted DP.

A true 3" DP goes a long way to significantly reducing the exhaust gas back-pressure that the turbine wheel sees, the choke point of the OEM turbochargers is the relatively small turbine housing, a catless DP will allow for maximum exhaust gas scavenging from the engine before the turbine wheel and housing itself become the limitation.

Only go high-flow catted if you want to stay on the right side of the boys in Blue, the catalytic converters are there for a reason but it's not for a performance benefit.

The ar' design catless are the best manufactured N54 DP on the market, but BMR and VRSF v2's are significantly cheaper and will offer the same results albeit at reduced sex appeal when compared side by side.

Oh and yeah ALL true 3" DP's should provide the same aural pleasure.

Thanks brother now I know which one to go for.. just bought a house so i need to keep missus happy for a month or so and then booyah im going to buy one of these and make the car breathe easier..

[bmwheath]

Originally Posted by Dingers

As long as the BMR pipes sound as good as AR Design I'm sold.

Has anyone heard the BMR pipes and can comment?

P.S. These would be for an N54.

I have the BMR 3'' catless pipes. Catless pipes sound great, then i added a BMW PE exhaust which made it much louder again... Sounds like a boat motor, apparently thats all the rage with bmw fans hahaha

[e36mmm]

Originally Posted by bmwheath

I have the BMR 3'' catless pipes. Catless pipes sound great, then i added a BMW PE exhaust which made it much louder again... Sounds like a boat motor, apparently thats all the rage with bmw fans hahaha

If you want to part ways with your exhaust, keep me in mind please

[JD75]

Originally Posted by bradsm87

If you still have secondary cats, I'd say you have exactly zero chance of issues with po-po. They can stick their head under the car and see cats. You can't really see the downpipes at all.

I bought Wagner Tuning because they have flex sections, I like the smooth openings to the turbo v-bands, they're 2.75" and they fit perfectly. Twin 2.75" pipes have the same area as a single 4" pipe which is huge so anyone who thinks there is a power difference between 2.75" and 3" under 450rwkw is kidding themselves IMO.

Hey mate,

do you happen to know how the fitment was on the Wagner DP's? How RHD friendly is the bank 1 turbo DP front o2 bung placement?

I actually sell the VRSF v2's as they are a great bang for buck DP they have excellent RHD fitment, I would be keen to have a look at the Wagner's too if I knew fitment was not a headfxxx.

[bradsm87]

Originally Posted by JD75

Hey mate,

do you happen to know how the fitment was on the Wagner DP's? How RHD friendly is the bank 1 turbo DP front o2 bung placement?

I actually sell the VRSF v2's as they are a great bang for buck DP they have excellent RHD fitment, I would be keen to have a look at the Wagner's too if I knew fitment was not a headfxxx.

Unfortunately, I did it 18 months ago and my memory is terrible. Fitment was good. Everything lined up well from memory. I'll stick my phone camera down in there tomorrow and take a couple of pics.

[_ink]

Originally Posted by JD75

Oh and yeah ALL true 3" DP's should provide the same aural pleasure.

When you say true 3" DP's you mean all the way to the flange right? My AR's and i believe all AR's have a longer 3" section, however the flange is a 2.5" which means the 3" section reduces to 2.5" right at the end.

[_ink]

Originally Posted by e36mmm

Thanks brother now I know which one to go for.. just bought a house so i need to keep missus happy for a month or so and then booyah im going to buy one of these and make the car breathe easier..

What?!?!?! You mean to say a house isn't enough to keep her happy?

[PG]

For anyone interested n54tuning downpipes with the black Friday sales are about 490 aud shipped and vrsf v2 about 530.