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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > NA Engine (non-turbo) / Drivetrain / Exhaust Modifications > Confused and need input.



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      07-20-2015, 05:16 PM   #1
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Confused and need input.

Hey guys as you can see I am new around here. Before its said, yes I have searched quite extensively actually and found really good information not only here but also on other forums. However, in my search for information I have not had really good luck in finding exact information that I am looking for and I wanted to ask you guys. My basic issue is that yes I know doing a few things isnt going to make it anywhere near a 335i but what is worth it and what isn't. Oh I almost forgot what I have. Its a 2008 328i w/n51 and auto (i know i know)

1. Intake - I currently have the charcoal filter delete and a K&N filter. Would it be worth it to do anything further?

2. Exhaust - I have read everyone loves the BMW PE but Im not sure I want to spend the money on mostly sound. Now my question here is would I get basically the same gains from better muffler/2nd cat del option? Mine is currently stock.

3. Tune - I have looked at AA for the N51 and it looks impressive but I havent really read a review of someone that has an n51 and auto. I do not have a local shop within a resonable distance away from me to go to. So, I would have to either pull the ECU out and send it or Pay extra to do it myself. I am not opposed to spending money but I want to make sure that I will actually be able to tell a difference.

Now you are probably going to ask what I want to change about the car. Really its throttle responsiveness and shifts. I come from a tuned truck which had lots of grunt and the ability to get the ass end out at will. I dont want to beat up my car but I would like to have a little fun with it. Thank you for your time and input.
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      07-20-2015, 05:31 PM   #2
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Quote:
Originally Posted by rfinger View Post
Hey guys as you can see I am new around here. Before its said, yes I have searched quite extensively actually and found really good information not only here but also on other forums. However, in my search for information I have not had really good luck in finding exact information that I am looking for and I wanted to ask you guys. My basic issue is that yes I know doing a few things isnt going to make it anywhere near a 335i but what is worth it and what isn't. Oh I almost forgot what I have. Its a 2008 328i w/n51 and auto (i know i know)

1. Intake - I currently have the charcoal filter delete and a K&N filter. Would it be worth it to do anything further?

2. Exhaust - I have read everyone loves the BMW PE but Im not sure I want to spend the money on mostly sound. Now my question here is would I get basically the same gains from better muffler/2nd cat del option? Mine is currently stock.

3. Tune - I have looked at AA for the N51 and it looks impressive but I havent really read a review of someone that has an n51 and auto. I do not have a local shop within a resonable distance away from me to go to. So, I would have to either pull the ECU out and send it or Pay extra to do it myself. I am not opposed to spending money but I want to make sure that I will actually be able to tell a difference.

Now you are probably going to ask what I want to change about the car. Really its throttle responsiveness and shifts. I come from a tuned truck which had lots of grunt and the ability to get the ass end out at will. I dont want to beat up my car but I would like to have a little fun with it. Thank you for your time and input.


I just got my file today actually, and I'm doing it myself with the simon tool. Once it's installed, and a few hundred miles is put on, ill let you know how much of a difference there is. I have an N51 Auto btw

As for the exhaust, I have listened to probably well over 100 videos of different combinations of mufflers on our auto cars and to be honest they all sound unappealing to me because their is no pause between shifts, and it's just one big steady stream of sound. With a manual however, hands down YES get the exhaust. I may actually end purchasing AFE catted headers and just keep the stock exhaust system except for the OEM resonator. Probably cut that out, put a y pipe on after section 1 to into a vibrant ultra quiet resonator on instead.

Haven't found a video of anyone with this setup, but i THINK it will sound okay, we shall see.
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      07-20-2015, 06:22 PM   #3
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Thank you for your input and I will be interested in hearing the results.
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      07-20-2015, 06:30 PM   #4
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      07-20-2015, 06:50 PM   #5
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Quote:
Originally Posted by rfinger View Post
1. Intake - I currently have the charcoal filter delete and a K&N filter. Would it be worth it to do anything further?[/b]
Not really, unless you want something that makes more noise.

Quote:
2. Exhaust - I have read everyone loves the BMW PE but Im not sure I want to spend the money on mostly sound. Now my question here is would I get basically the same gains from better muffler/2nd cat del option? Mine is currently stock.[/b]
gains on the muffler delete are debatable. some have reported it felt like the car lost response with a MD. you will get drone though. deleting the 2nd cats will free up a little bit of power. The sound may get a little raspy, maybe someone else can chime in on that though.

Quote:
3. Tune - I have looked at AA for the N51 and it looks impressive but I havent really read a review of someone that has an n51 and auto. ...what I want to change about the car...its throttle responsiveness and shifts. .
The AA tune will change the throttle mapping, which will make the car more responsive. Out of everything you mentioned above, the AA tune will probably give the most bang for the buck, especially since you've already modded the stock intake. I'd get the tune, as the throttle lag is really evident on the automatic cars, and just getting that fixed makes the car feel a whole lot better.
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      07-20-2015, 07:11 PM   #6
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Quote:
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All of my threads are for n51 and auto
Wait...you're an N51?
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      07-20-2015, 07:12 PM   #7
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Quote:
Originally Posted by TheAxiom View Post
Wait...you're an N51?
yeah...check the dyno i just posted
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      07-20-2015, 07:24 PM   #8
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Quote:
Originally Posted by Mike.
Quote:
Originally Posted by TheAxiom View Post
Wait...you're an N51?
yeah...check the dyno i just posted
Is that the SULVE version?
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      07-20-2015, 07:25 PM   #9
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Quote:
Originally Posted by E93Manny335 View Post
Is that the SULVE version?
i mean yeah, but mine isnt too SULV whatever anymore
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      07-20-2015, 07:27 PM   #10
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i mean yeah, but mine isnt too SULV whatever anymore
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      07-20-2015, 10:08 PM   #11
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I have a N51 automatic with the AA tune, it's worth the investment.
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      07-21-2015, 09:00 AM   #12
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So its looking like a AA Tune, RM Boot, leave the intake as is. Lastly, what about the Cyba scoops...worth it?
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      07-21-2015, 09:08 AM   #13
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Quote:
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So its looking like a AA Tune, RM Boot, leave the intake as is. Lastly, what about the Cyba scoops...worth it?
Not really unless you like the looks, which I did.

What about headers
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      07-21-2015, 09:29 AM   #14
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Not really unless you like the looks, which I did.

What about headers
Oh I want them I just do not have the funds currently. As for those Im not sure which I was speaking with AA about theirs....
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      07-21-2015, 09:32 AM   #15
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just get the tune. the rest of it is a waste of time IMO.
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      07-21-2015, 09:34 AM   #16
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Thanks to Tom Droze for the link as I just ordered the RM Boot.
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      07-21-2015, 11:18 AM   #17
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Quote:
Originally Posted by rfinger View Post
Oh I want them I just do not have the funds currently. As for those Im not sure which I was speaking with AA about theirs....
Does is actually do anything performance wise?
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      07-21-2015, 11:19 AM   #18
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Does is actually do anything performance wise?
Headers? I gained around 20whp and 18ftlbs off of AFE's...

So, very much so.
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      07-21-2015, 11:20 AM   #19
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Quote:
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Headers? I gained around 20whp and 18ftlbs off of AFE's...

So, very much so.
I guess this would be based on a dyno of some sort, hmmm?
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      07-21-2015, 11:27 AM   #20
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Originally Posted by TheAxiom View Post
I guess this would be based on a dyno of some sort, hmmm?
Now that, I do have dyno sheets for
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      07-21-2015, 11:36 AM   #21
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Headers? I gained around 20whp and 18ftlbs off of AFE's...

So, very much so.
I apologize I should have been more specific. I was referring to the Scoops.
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      07-21-2015, 11:36 AM   #22
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Quote:
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I apologize I should have been more specific. I was referring to the Scoops.
Oh, sorry - I mean, people claim X HP gains, at Y MPH, but in reality. I highly doubt it. Now, I have a pair - just because the red looks so mean behind the black grill.
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