[NICKTENN]

Originally Posted by daveyfx

Hopefully a high-flow catted downpipe will come out soon. I like the power gains, but don't care much for the noise from going catless.

CG Precision makes one for the 340.

[mtx450]

Originally Posted by daveyfx

Hopefully a high-flow catted downpipe will come out soon. I like the power gains, but don't care much for the noise from going catless.

Yeah, I'm sorta in the same boat. I would welcome the extra noise, but am just nervous to deal with the whole CEL. I know the JB4 can make the light go away, but it still won't pass inspection in my state (NY) because the drive-cycle monitors will never go "ready".

[Mike@N54Tuning.com]

Originally Posted by daveyfx

Hopefully a high-flow catted downpipe will come out soon. I like the power gains, but don't care much for the noise from going catless.

ER has the catted version available They are just built to order.. We have the option to make them catted in a drop down box on our site.

Mike

[mtx450]

Originally Posted by Mike@N54Tuning.com

ER has the catted version available They are just built to order.. We have the option to make them catted in a drop down box on our site.

Mike

Awesome, good to know. I may be reaching here, but any possibility of getting some dyno data comparing the two?

[Big Nodge]

And another question, does going with a catted DP eliminate CEL problems on the F30? I had CEL issues in the past with high flow cats on my Audis and passing emissions was always a pain. Been leaning towards leaving the cat/DP alone on my 340i as a result.

[mtx450]

Originally Posted by Big Nodge

And another question, does going with a catted DP eliminate CEL problems on the F30? I had CEL issues in the past with high flow cats on my Audis and passing emissions was always a pain. Been leaning towards leaving the cat/DP alone on my 340i as a result.

I'm not sure of the cats they are using in the DP, but my guess would be yes we would not have any problems. Otherwise why else would they go through the trouble? Again, I could be wrong so we'll wait for Mike to chime in.

[Mike@N54Tuning.com]

Originally Posted by mtx450

Awesome, good to know. I may be reaching here, but any possibility of getting some dyno data comparing the two?

The rule of thumb on the modern BMWs is that the high flow catted gains are bout 50% of the gains of catless.

So if getting 30 whp from catless expect about 15 whp from high flow catted

Mike

[Mike@N54Tuning.com]

Originally Posted by Big Nodge

And another question, does going with a catted DP eliminate CEL problems on the F30? I had CEL issues in the past with high flow cats on my Audis and passing emissions was always a pain. Been leaning towards leaving the cat/DP alone on my 340i as a result.

Catted will not stop the CEL. BMW software tolerances are too rigid.

Mike

[davis31b]

Originally Posted by soultraveler00

Guys i'm placing an order for this and want to combine it with the AWE exhaust w/mid pipe. Should i get the downpipe in brushed or polished? Does it matter? Will i need the extra O2 Bung or EGT Bung? I'm not sure what these are. Id appreciate the help.

You might want to consider the black ceramic coat option to help reduce the heat. It's only $90 more dollars but could be worth it at the end of the day.

[Big Nodge]

Thanks. Seems like go catless or go home when it comes to downpipes then.

[mtx450]

Originally Posted by Big Nodge

Thanks. Seems like go catless or go home when it comes to downpipes then.

Exactly my thoughts.

[Mike@N54Tuning.com]

Originally Posted by Big Nodge

Thanks. Seems like go catless or go home when it comes to downpipes then.

yuppers..

Mike

[daveyfx]

Is there a substantial difference in noise output comparing catless vs catted?

[Mike@N54Tuning.com]

Originally Posted by daveyfx

Is there a substantial difference in noise output comparing catless vs catted?

Catless will be louder deeper sounding.

Mike

[marcel b]

Originally Posted by Mike@N54Tuning.com

Catted will not stop the CEL. BMW software tolerances are too rigid.

Mike

really? I had a metalcat (hjs) in the downpipe of my 1M and never had a CEL. The B58 is more sensitive?

Marcel

[Mike@N54Tuning.com]

Originally Posted by marcel b

really? I had a metalcat (hjs) in the downpipe of my 1M and never had a CEL. The B58 is more sensitive?

Marcel

A CEL will pretty much always appear. Maybe not right away. ITs a balance between high flow and efficiency. I would argue if a CEL does not appear then the cats that were in the downpipes are not much different then the stock ones as BMW tolerances are EXTREMELY tight.

Mike

[mtndog]

Originally Posted by Mike@N54Tuning.com

Its a 1-2 hour job. Pretty simple.

Mike

This is misleading and I have to disagree with the "pretty simple" on a 340ix. Maybe a seasoned mechanic with a lift can do it in 1-2 hours but not a DIY in the garage with ramps. I'd love to hear from others that have installed this on a 340i or x and how they got access to the v-band.
Too bad as I was really looking forward to this mod.

[Blk340i]

Originally Posted by mtndog

This is misleading and I have to disagree with the "pretty simple" on a 340ix. Maybe a seasoned mechanic with a lift can do it in 1-2 hours but not a DIY in the garage with ramps. I'd love to hear from others that have installed this on a 340i or x and how they got access to the v-band.
Too bad as I was really looking forward to this mod.

You can access it but it's tight. To loosen the clamp you need a flex joint on the Rachet and you reach it but I will say it's a bit of a PITA but doable.

[Mike@N54Tuning.com]

Originally Posted by mtndog

This is misleading and I have to disagree with the "pretty simple" on a 340ix. Maybe a seasoned mechanic with a lift can do it in 1-2 hours but not a DIY in the garage with ramps. I'd love to hear from others that have installed this on a 340i or x and how they got access to the v-band.
Too bad as I was really looking forward to this mod.

I would never recommend any exhaust work without a lift, so in my statement I assume the car is on a lift.

The XI are usually a little more time consuming the RWD. (tighter)

Mike

[B3 BT]

Hi,

I installed mine this weekend on a 340xi. I got no trouble accessing the clamp. The hardest part for me was getting the OEM DP out. I did it from below. It seems impossible from above unless you take of the turbo. I needed, as expected, to remove the exhaust system.

[ray340i]

Just ordered my ER catless downpipe to go with my jb4 and bms filter !!!
can't wait dyno coming sorry for the wait =)

[Mike@N54Tuning.com]

Originally Posted by ray340i

Just ordered my ER catless downpipe to go with my jb4 and bms filter !!!
can't wait dyno coming sorry for the wait =)

Can't wait to hear your impressions!!

Mike