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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 > AA N52 Signature Exhaust HP Gains?



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      12-12-2012, 06:37 PM   #23
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Quote:
Originally Posted by idrift4wd View Post
I highly doubt they are getting 4-5 hp anyways.

maybe 1 hp lol

if you car is faster by anychance....its because your saving weight.

600 dollars hahaha. You can get a muffler delete, a resonator, and new tips for less then HALF the price. a muffler shop can custom fabricate a cat-back system for that price.
or just get the AA tune instead for $500 and you'll actually make 10-15+ more hp. I'd rather have that than more noise.
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      12-12-2012, 07:09 PM   #24
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Quote:
Originally Posted by Doc K View Post
When I did my muffler delete, I noticed more pull on my car. That stock exhaust is so restrictive. You're better off getting a muffler delete. The AA Exhaust just looks nice, IMO.
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Originally Posted by Wrngway View Post
The AA Exhaust should have less drone now that folks are figuring out what's causing it with that system. It sounds like a slight modification to the hangers will elminate most of the drone around 2k rpm. The resonance chamber also works to reduce it.
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Originally Posted by iczz View Post
AA exhaust is muffler delete with resonance chamber to reduce drone.

I think AA claims about 4-5 hp gain in the development stage, which is not bad for a system like this.

You will get more hp gain if you do 2nd cat delete or even primary cat delete.
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Originally Posted by 335BBS View Post
I don't think anyone here would notice 4-5 hp.
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Originally Posted by idrift4wd View Post
I highly doubt they are getting 4-5 hp anyways.

maybe 1 hp lol

if you car is faster by anychance....its because your saving weight.

600 dollars hahaha. You can get a muffler delete, a resonator, and new tips for less then HALF the price. a muffler shop can custom fabricate a cat-back system for that price.
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Originally Posted by Kolyan2k View Post
0-1hp is probably correct
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Originally Posted by mike-y View Post
or just get the AA tune instead for $500 and you'll actually make 10-15+ more hp. I'd rather have that than more noise.
Thanks for the responses guys. I am probably not going to do a muffler delete due to the fact that I dont really like the extremely deep hum that comes with a delete. Too muscle car sounding for me haha.

I'll look into the AA tune in the future. The next thing im going to do is to get my windows tinted!
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      12-12-2012, 08:06 PM   #25
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Quote:
Originally Posted by cuiter23 View Post
Thanks for the responses guys. I am probably not going to do a muffler delete due to the fact that I dont really like the extremely deep hum that comes with a delete. Too muscle car sounding for me haha.

I'll look into the AA tune in the future. The next thing im going to do is to get my windows tinted!

Window tints add 25hp easily!
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      12-12-2012, 08:42 PM   #26
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Window tints add 25hp easily!
They have nothing on my e90post stickers, an instant 50hp gain LOL
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      12-12-2012, 08:44 PM   #27
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a muffler delete will run you about $150-$200 and sounds as good (if not better) than most exhausts and will likely have a better hp gain

i've done it on my 328 and 335 and it sounds so good i probably wouldn't spend the money on an exhaust unless i was getting an m car
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      01-13-2017, 05:08 PM   #28
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Quote:
Originally Posted by E90 LCI View Post
Just do a muffler delete for $100 and it sounds amazing
no.. such shitty advice. muffler deletes are for 100hp civic's.

if you want real gains from your N52 without spending such ridiculous sums on a catback, delete your secondary cats and upgrade your muffler.
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      01-13-2017, 10:04 PM   #29
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Quote:
Originally Posted by 6IX-F10-N52 View Post
no.. such shitty advice. muffler deletes are for 100hp civic's.

if you want real gains from your N52 without spending such ridiculous sums on a catback, delete your secondary cats and upgrade your muffler.
It's all subjective. I was very happy with my muffler delete, until I did the headers.
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      01-13-2017, 11:43 PM   #30
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So HP gains might not be that much. I dyno'd the other day and I put out 187WHP and 175WTQ max before the temps came up. I've got a full Eisenmann exhaust and it was with the stock box. I'm going to try an AFE drop in next and I got my headers installed recently so when I go back I expect to be over 200whp and wtq.
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      01-14-2017, 01:21 AM   #31
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Quote:
Originally Posted by Eagle1oh7 View Post
So HP gains might not be that much. I dyno'd the other day and I put out 187WHP and 175WTQ max before the temps came up. I've got a full Eisenmann exhaust and it was with the stock box. I'm going to try an AFE drop in next and I got my headers installed recently so when I go back I expect to be over 200whp and wtq.
No tune?
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      01-14-2017, 01:34 AM   #32
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No tune?
BPC will be arriving next Thursday at the latest. I'm fucking excited! LOL!
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      01-14-2017, 04:42 PM   #33
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Quote:
Originally Posted by Eagle1oh7 View Post
So HP gains might not be that much. I dyno'd the other day and I put out 187WHP and 175WTQ max before the temps came up. I've got a full Eisenmann exhaust and it was with the stock box. I'm going to try an AFE drop in next and I got my headers installed recently so when I go back I expect to be over 200whp and wtq.
did you dyno your car before you installed the exhaust? how much power do you think you gains from the exhaust? do you feel any power increase, particularly in the high end?
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      01-14-2017, 04:45 PM   #34
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Quote:
Originally Posted by Ruddigger View Post
It's all subjective. I was very happy with my muffler delete, until I did the headers.
a muffler delete isnt subjective. you were happy with it purely because of the sound, but you did not take other considerations into effect such as the lack of pressure for low-rpm driving. you can hear the droning at lower rpm because you have no muffler to help with this. as a result, a muffler delete simply isnt good for a naturally aspirated engine. its different for other engines like the n54/n55 which rely on a certain amount of exhaust flow to let the turbo spool, meaning those engines dont necessarily need the backpressure.

headers with a muffler delete must sound like certified garbage. are you still running with no muffler?
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      01-14-2017, 04:50 PM   #35
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Quote:
Originally Posted by 6IX-F10-N52 View Post
a muffler delete isnt subjective. you were happy with it purely because of the sound, but you did not take other considerations into effect such as the lack of pressure for low-rpm driving. you can hear the droning at lower rpm because you have no muffler to help with this. as a result, a muffler delete simply isnt good for a naturally aspirated engine. its different for other engines like the n54/n55 which rely on a certain amount of exhaust flow to let the turbo spool, meaning those engines dont necessarily need the backpressure.

headers with a muffler delete must sound like certified garbage. are you still running with no muffler?
I did notice a slight loss in torque, but a little more up top, and I had zero drone, since I kept the resonator. I now have a muffler and it sounds worse than the delete, looking into other mufflers at the moment.
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      01-14-2017, 05:41 PM   #36
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Quote:
Originally Posted by Ruddigger View Post
I did notice a slight loss in torque, but a little more up top, and I had zero drone, since I kept the resonator. I now have a muffler and it sounds worse than the delete, looking into other mufflers at the moment.
consider deleting your secondary cats before upgrading your muffler and see if this will give you the sound you are looking for. keep in mind you wont get the full sound as soon as you make any exhaust modification.
100 miles of no full throttle and then another 150 miles of mixed driving with some full throttle pulls will let the ecu adjust and give you the full sound.

is the loss in torque noticeable?
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      01-14-2017, 06:13 PM   #37
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It's slight, but I got used to the torque loss, my car is set up for canyons so I keep it high in the rev range anyway. I have secondaries deleted already, and I'm not doing mods for sound but for weight loss and performance. But the straight pipe was too loud for the street, so I'm trying to find another low weight alternative muffler to tone things down a bit.
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      01-14-2017, 06:17 PM   #38
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Sorry for the thread jack op....but how are people deleting their secondaries.
Cutting them out/gutting...etc...and are you welding in stainless or!
TIA
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      01-14-2017, 06:22 PM   #39
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when I had my 328 I cut those suckers out and replaced them with new mid pipes. This setup was pretty loud considering I had the PE exhaust too.

When I put the headers on I threw the secondary cats back in.
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      01-14-2017, 07:12 PM   #40
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You don't lose torque with a muffle delete, you don't ne back pressure.
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      01-14-2017, 08:24 PM   #41
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Quote:
Originally Posted by TheAxiom View Post
You don't lose torque with a muffle delete, you don't ne back pressure.
+1 this isn't how engines work. if "back pressure" was good, and we apply that same logic to headers, then catless headers must be horrible. Think of the (lack of) back pressure XD why would you want exhaust gasses backing up at the exhaust ports anyways? The whole point of an improved exhaust system is scavenging - the entire premise is to speed up gasses exiting the exhaust ports so that they get away from the motor quicker.
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      01-14-2017, 11:40 PM   #42
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Quote:
Originally Posted by Mike. View Post
when I had my 328 I cut those suckers out and replaced them with new mid pipes. This setup was pretty loud considering I had the PE exhaust too.

When I put the headers on I threw the secondary cats back in.
PE doesn't come with a resonator right?
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      01-14-2017, 11:45 PM   #43
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Quote:
Originally Posted by 6IX-F10-N52 View Post
did you dyno your car before you installed the exhaust? how much power do you think you gains from the exhaust? do you feel any power increase, particularly in the high end?
No. The throttle response felt better but that may have been the buttdyno. I didn't bother getting a dyno before I got the exhaust since I bought it to spite my wife and wasn't really thinking about it.
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      01-15-2017, 01:01 AM   #44
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Quote:
Originally Posted by Eagle1oh7 View Post
No. The throttle response felt better but that may have been the buttdyno. I didn't bother getting a dyno before I got the exhaust since I bought it to spite my wife and wasn't really thinking about it.
lmao. and the buttdyno does not get the credit it deserves these days.

if you FEEL a difference, its a difference. at least thats what i think lol
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