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Technical Topics B48 4-Cylinder Turbo Engine / Drivetrain / Exhaust Modifications Is a downpipe worth it?

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      04-09-2024, 07:35 PM   #1
grey330
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Hey everyone,

I have a 2019 330i. Right now I have a JB+ on it set at around 2.3 psi. So far it feels great, much smoother and pulls hard in the low rpm range. Soon I will be buying and installing a Dinan intake

Dinan Intake: https://www.dinancars.com/products/i...arts/D760-0070

I am also considering installing a downpipe but I’m on the fence. If I were to do it, I want something that doesn’t give a CEL, doesn’t have a strong smell, and is good quality. I’ve checked out a couple threads and it seems like everyone agrees that the AA catted downpipe is the way to go

AA Downpipe: https://x-ph.com/active-autowerke-bm...tted-downpipe/

Is it really worth it? I’m looking for a more sporty drive but don’t want to compromise anything as this is my daily. Honestly, a downpipe and intake is the furthest I will go with performance modification. The only reason I am considering it is because I want to bring the JB+ up to 3.5 psi but am adraid it won’t do well with the stock system. Considering that, is it a waste to spend the money? Will the downpipe create a noticeable difference or is it over the top for the place I’m at?

Just looking for some outside perspectives because nobody I know has experience with this. Thank you!
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      04-10-2024, 11:04 AM   #2
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The downpipe and intake will upgrade the sound and performance of the car; if that is what you are looking for, then it's certainly worth it.

If the only reason you are getting them is to be able to increase the JB+ to 3.5 PSI, then it's not worth it, as you can increase the JB+ to 3 PSI without any mods.
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      04-10-2024, 12:13 PM   #3
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Yes. Downpipes are well worth it. Even the AA which is the most expensive. There are many others that are very good quality too but they most likely with give your cel.
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      04-10-2024, 02:11 PM   #4
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Quote:
Originally Posted by Randy Johnson View Post
Yes. Downpipes are well worth it. Even the AA which is the most expensive. There are many others that are very good quality too but they most likely with give your cel.
+1 for AA, their warranty is unmatched. they replace the downpipe quickly if you get a CEL
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      04-10-2024, 05:14 PM   #5
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Quote:
Originally Posted by mike@x-ph.com View Post
+1 for AA, their warranty is unmatched. they replace the downpipe quickly if you get a CEL
Thank you all for the info. I feel reassured since you all speak very highly of it. Will definitely purchase. Do you have a website you recommend or is it good to get it straight from AA? I saw some other posts saying you are involved with sales of some sort.
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      04-11-2024, 11:33 AM   #6
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Quote:
Originally Posted by grey330 View Post
Thank you all for the info. I feel reassured since you all speak very highly of it. Will definitely purchase. Do you have a website you recommend or is it good to get it straight from AA? I saw some other posts saying you are involved with sales of some sort.
its cheaper to get it from us vs Active Autowerke directly, here is our website www.x-ph.com
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      04-14-2024, 04:09 PM   #7
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Quote:
Originally Posted by mike@x-ph.com View Post
its cheaper to get it from us vs Active Autowerke directly, here is our website www.x-ph.com
Alright thank you. One more specific question: I see two downpipe options for my car. I have a 2019 BMW 330i (G series, B48 engine). One says B46 and another says B48 but for the EU/Asia spec.

I am in the USA, does that mean I should buy the one listed for B46 engines? Just want to make sure I get the right one.
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      04-14-2024, 09:13 PM   #8
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Yes, downpipes are definitely worth the investment, even the AA brand, which is known to be one of the more expensive options. While there are other brands that offer good quality at a lower price point, they may trigger your check engine light (CEL) as well.
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      04-15-2024, 10:33 AM   #9
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Quote:
Originally Posted by grey330 View Post
Alright thank you. One more specific question: I see two downpipe options for my car. I have a 2019 BMW 330i (G series, B48 engine). One says B46 and another says B48 but for the EU/Asia spec.

I am in the USA, does that mean I should buy the one listed for B46 engines? Just want to make sure I get the right one.
Yes USA cars are B46, thats the downpipe you should choose
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