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Technical Topics B58 6-Cylinder Turbo Engine / Drivetrain / Exhaust Modifications AA Catted DP

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      10-15-2021, 05:37 PM   #23
P_Leotardo
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Where do you notice the power gains from adding an aftermarket down pipe to the B58? Itís obviously quick off the line, so would it increase say 60-120mph acceleration?
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      10-16-2021, 01:13 PM   #24
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**update**

Canceled original appointment and got the install done today for $256! I'm in the DC metro and was quoted $500, $660, and $256!

Initial thoughts:

Sound/tone is perfect. Probably 15-20% louder. Turbo spool is louder, overall exhaust note is more profound, plenty of burbles. I didn't want a real loud car, it's not real loud. But it is very noticeable and just sounds mean.

Power feels substantial. I have BMS intake and JB4. Generally drive in Map 1 or 2. Car flat out rips.

There is very minimal exhaust odor. I expected a slight exhaust smell and it has a slight exhaust smell.

As advertised, no CEL.
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      10-16-2021, 04:12 PM   #25
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Quote:
Originally Posted by aeaustinG20 View Post
**update**

Canceled original appointment and got the install done today for $256! I'm in the DC metro and was quoted $500, $660, and $256!

Initial thoughts:

Sound/tone is perfect. Probably 15/20% louder. Turbo spool is louder, overall exhaust note is more profound, plenty of burbles. I didn't want a real loud car, it's not real loud. But it is very noticeable and just sounds mean.

Power feels substantial. I have BMS intake and JB4. Generally drive in Map 1 or 2. Car flat out rips.

There is very minimal exhaust odor. I expected a slight exhaust smell and it has a slight exhaust smell.

As advertised, no CEL.
Do you have a dragy? Very curious to see some times/distances
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      10-16-2021, 05:31 PM   #26
aeaustinG20
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Quote:
Originally Posted by P_Leotardo View Post
Quote:
Originally Posted by aeaustinG20 View Post
**update**

Canceled original appointment and got the install done today for $256! I'm in the DC metro and was quoted $500, $660, and $256!

Initial thoughts:

Sound/tone is perfect. Probably 15/20% louder. Turbo spool is louder, overall exhaust note is more profound, plenty of burbles. I didn't want a real loud car, it's not real loud. But it is very noticeable and just sounds mean.

Power feels substantial. I have BMS intake and JB4. Generally drive in Map 1 or 2. Car flat out rips.

There is very minimal exhaust odor. I expected a slight exhaust smell and it has a slight exhaust smell.

As advertised, no CEL.
Do you have a dragy? Very curious to see some times/distances
I don't but it's on the short list..
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      10-16-2021, 05:59 PM   #27
G_B58
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Quote:
Originally Posted by P_Leotardo View Post
Do you have a dragy? Very curious to see some times/distances
I went from doing 4.2/4.3 with just an axleback, to 3.78 by adding the AA dp. Measured with draggy.
2020 xdrive.
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      10-16-2021, 06:58 PM   #28
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Quote:
Originally Posted by G_B58 View Post
I went from doing 4.2/4.3 with just an axleback, to 3.78 by adding the AA dp. Measured with draggy.
2020 xdrive.
What about rolling speeds. Was the car much quicker from 60-100/120?
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      10-16-2021, 08:09 PM   #29
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Haven't really tested that, but it definitely feels peppier from off the line or from a roll. It's probably the only mod that doesn't have any downside (except grey area for warranty and possible extra stress on the turbo).
Are u on the fence about getting one or just curious bout the numbers?
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      10-16-2021, 09:59 PM   #30
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Quote:
Originally Posted by G_B58 View Post
Haven't really tested that, but it definitely feels peppier from off the line or from a roll. It's probably the only mod that doesn't have any downside (except grey area for warranty and possible extra stress on the turbo).
Are u on the fence about getting one or just curious bout the numbers?
I'm on the fence about getting one. Not necessarily in it for drag times, but I like working on the car and a down pipe is easy enough. Currently have the Dinan axle back on the car. Kinda curious about this extra stress on turbo
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      10-17-2021, 05:10 AM   #31
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Quote:
Originally Posted by G_B58 View Post
Haven't really tested that, but it definitely feels peppier from off the line or from a roll. It's probably the only mod that doesn't have any downside (except grey area for warranty and possible extra stress on the turbo).
Are u on the fence about getting one or just curious bout the numbers?
Objectively the car is very quick off the line, there isnít much more I can ask for in that aspect. In videos of the M340i against the F80 for example, it loses steam and gives up ground down the line. If a downpipe was to improve that I am sold.
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      10-17-2021, 10:46 AM   #32
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Quote:
Originally Posted by P_Leotardo View Post
Objectively the car is very quick off the line, there isnít much more I can ask for in that aspect. In videos of the M340i against the F80 for example, it loses steam and gives up ground down the line. If a downpipe was to improve that I am sold.
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      10-17-2021, 12:41 PM   #33
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Quote:
Originally Posted by mike@x-ph.com View Post
Idk how to read that lol what does it mean
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      10-17-2021, 01:49 PM   #34
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Quote:
Originally Posted by P_Leotardo View Post
Quote:
Originally Posted by mike@x-ph.com View Post
Idk how to read that lol what does it mean
Higher power and torque across the board with the power being noticeably higher at the top end.

There's a decent (and better than I can explain) explanation here: https://www.darksidedevelopments.co....-a-dyno-graph/
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      10-17-2021, 02:28 PM   #35
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Quote:
Originally Posted by Jim-Bow View Post
Higher power and torque across the board with the power being noticeably higher at the top end.

There's a decent (and better than I can explain) explanation here: https://www.darksidedevelopments.co....-a-dyno-graph/
The power is more noticeable on the top end? Even stock?

I would have thought it would have been quicker spooling so better results off the line. I've found from a stop or going from cruising to WOT the difference is huge. Also, just the the improvement is worth it, the main reason I went with it actually.
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      10-17-2021, 08:44 PM   #36
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I have a 2021 RWD with the AA DP + MPE + JB4 Map 3 E30 and I ran a 12.1@119mph (2.06 60í) in ~1400 DA per Dragy.

Iíve since added an MST intake and running a custom Map 6, but havenít had a chance to do any 1/4 mile runs.
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      Today, 11:03 AM   #37
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Quote:
Originally Posted by aeaustinG20 View Post
**update**

Canceled original appointment and got the install done today for $256! I'm in the DC metro and was quoted $500, $660, and $256!

Initial thoughts:

Sound/tone is perfect. Probably 15-20% louder. Turbo spool is louder, overall exhaust note is more profound, plenty of burbles. I didn't want a real loud car, it's not real loud. But it is very noticeable and just sounds mean.

Power feels substantial. I have BMS intake and JB4. Generally drive in Map 1 or 2. Car flat out rips.

There is very minimal exhaust odor. I expected a slight exhaust smell and it has a slight exhaust smell.

As advertised, no CEL.
What shop did you end up using? I'm also in the DC Metro area. Thanks!
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      Today, 02:27 PM   #38
aeaustinG20
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Quote:
Originally Posted by drislanej View Post
Quote:
Originally Posted by aeaustinG20 View Post
**update**

Canceled original appointment and got the install done today for $256! I'm in the DC metro and was quoted $500, $660, and $256!

Initial thoughts:

Sound/tone is perfect. Probably 15-20% louder. Turbo spool is louder, overall exhaust note is more profound, plenty of burbles. I didn't want a real loud car, it's not real loud. But it is very noticeable and just sounds mean.

Power feels substantial. I have BMS intake and JB4. Generally drive in Map 1 or 2. Car flat out rips.

There is very minimal exhaust odor. I expected a slight exhaust smell and it has a slight exhaust smell.

As advertised, no CEL.
What shop did you end up using? I'm also in the DC Metro area. Thanks!
"Brothers' Garage" in Arlington.

Happy with the work, price and availability.
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      Today, 06:53 PM   #39
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What's the general consensus on VRSF high flow catted vs AA? I'm thinking of just doing VRSF with a tune for less than the price of AA downpipe by itself.
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      Today, 06:55 PM   #40
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Quote:
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What's the general consensus on VRSF high flow catted vs AA? I'm thinking of just doing VRSF with a tune for less than the price of AA downpipe by itself.
Performance is the same.

AA uses GESI cats which are EPA approved and do not throw a check engine light even without a tune (guaranteed)

If you are using a tune, you wont get a check engine light no matter which downpipe you use but keep in mind that does not make the car emission legal and you will still fail the emission inspection even if there is no check engine light showing
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