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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 > (NEED ADVICE) New Exhaust set-up UPDATED



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      08-24-2014, 01:51 PM   #23
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Quote:
Originally Posted by TheAxiom View Post
You're just better off buying AFE headers or Euro headers. The stock manifolds are crap, the primaries are too short, the merge is terrible, etc etc. Essentially anything is better than those boat anchors.
True but some guy did it with stock manifolds and I saw pretty good gains, I wouldn't spend over $1000 for something that doesn't give too much power. Gotta balance the money-to-gains ratio lol
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      08-25-2014, 11:33 PM   #24
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UPDATED.
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      08-27-2014, 03:31 PM   #25
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Should I replace the current glasspack with the stock resonator?
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      08-27-2014, 03:34 PM   #26
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Would the stock resonator work better than the current glasspack for more backpressure?
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      08-27-2014, 07:50 PM   #27
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Back pressure is bad, period. Single 3 inch back with an inline resonator and a good muffler. You should be fine.
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      08-27-2014, 08:11 PM   #28
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I think I decided on an Vibrant Ultra Quiet Resonator, I may or may not remove the glasspack.

Quote:
Originally Posted by TheAxiom View Post
Back pressure is bad, period. Single 3 inch back with an inline resonator and a good muffler. You should be fine.
You need it for low end torque on NA cars
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      08-27-2014, 08:30 PM   #29
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lol. Can you please explain why you need back pressure
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      08-27-2014, 09:30 PM   #30
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Quote:
Originally Posted by hot330i View Post
if you don't like it too loud, then I suggest putting back the OEM muffler
this is what I have before, super sprint headers and mid pipes, resonator delete into PE exhaust, like you said it is way too raspy and loud; putting back the OEM muffler reduced the sound 10X, you will hear just a little hum
sell your SS headers
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      08-27-2014, 10:48 PM   #31
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Quote:
Originally Posted by b-man View Post
lol. Can you please explain why you need back pressure
I don't know how many different ways I can politely say he doesn't know wtf he's talking about.
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      08-27-2014, 10:53 PM   #32
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Quote:
Originally Posted by TheAxiom View Post
I don't know how many different ways I can politely say he doesn't know wtf he's talking about.
I tend to agree but I'd like to know why he said that. Cause I don't agree with him.
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      08-28-2014, 02:02 AM   #33
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Quote:
Originally Posted by TheAxiom View Post
I don't know how many different ways I can politely say he doesn't know wtf he's talking about.
I do see your responses but you don't know what you're talking about so I don't bother replying.


Backpressure is bad and I do have my terms wrong. When you're pipes are too small, there's too much backpressure and you lose power. When they're too large, you lose VELOCITY, which if you don't have enough of you lose power. Having a 3inch pipe is probably too large for our NA engines. Sure for high end its great but wtf about low end? You're torqueless for days low end and you're not going anywhere in a high gear at 2000rpm. If you had a drag car, sure go for it but this is my daily. I need a compromise. Having JUST enough backpressure helps pick up low end. Adding these things doesn't necessarily help make your tq or hp peak higher or lower but it shifts the peak around. In my case I don't want my torque too high which sacrifices my low end.

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      08-28-2014, 02:04 AM   #34
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Anyways I already decided, I got a Vibrant Ultra Quiet resonator. I may replace the current glasspack I have with it or just add it somewhere along the piping.
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      08-28-2014, 09:13 AM   #35
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Quote:
Originally Posted by Amini77 View Post
I do see your responses but you don't know what you're talking about so I don't bother replying.


Backpressure is bad and I do have my terms wrong. When you're pipes are too small, there's too much backpressure and you lose power. When they're too large, you lose VELOCITY, which if you don't have enough of you lose power. Having a 3inch pipe is probably too large for our NA engines. Sure for high end its great but wtf about low end? You're torqueless for days low end and you're not going anywhere in a high gear at 2000rpm. If you had a drag car, sure go for it but this is my daily. I need a compromise. Having JUST enough backpressure helps pick up low end. Adding these things doesn't necessarily help make your tq or hp peak higher or lower but it shifts the peak around. In my case I don't want my torque too high which sacrifices my low end.

Who told you that? Are you just making things up now?
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      08-28-2014, 11:28 AM   #36
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Quote:
Originally Posted by TheAxiom View Post
Who told you that? Are you just making things up now?
Who told you that 3 inch is good? For turbod cars it's good not for NA. You are honestly clueless. Slap yourself.
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      08-28-2014, 12:04 PM   #37
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Quote:
Originally Posted by Amini77 View Post
Who told you that 3 inch is good? For turbod cars it's good not for NA. You are honestly clueless. Slap yourself.

So you admit you don't know what you're talking about? I'm ok with that.

I think you're making a stupid move, and if you're happy with it, so am I. But you do know sections of the stock exhaust are 3 inches in diameter, right? And that all N series race cars use a single 3 inch exhaust as well.

But you're right, We are ALL clueless. Have fun with adding back pressure on the small exhaust of yours.
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      08-28-2014, 01:00 PM   #38
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Quote:
Originally Posted by Amini77 View Post
Anyways I already decided, I got a Vibrant Ultra Quiet resonator. I may replace the current glasspack I have with it or just add it somewhere along the piping.
I think 3" is too much unless you're over 325hp. I'd go with 2.75

Good luck with whatever you decide! Let us know how it comes out
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      08-28-2014, 03:26 PM   #39
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Quote:
Originally Posted by TheAxiom View Post
So you admit you don't know what you're talking about? I'm ok with that.

I think you're making a stupid move, and if you're happy with it, so am I. But you do know sections of the stock exhaust are 3 inches in diameter, right? And that all N series race cars use a single 3 inch exhaust as well.

But you're right, We are ALL clueless. Have fun with adding back pressure on the small exhaust of yours.
I never admitted I don't know what I'm talking about. It seems like you're so full of yourself you're just making shit up. Do you have a link to share? Do you have supported facts? Dynos? Anything? So far you've been talking out of your ass. I never said ALL of you, I said you specifically don't know what you're talking about.

You say a race car...okay am I a race car? I need a compromise for like the 3rd time I've said. I'm not going to be in a higher rev range while I'm driving like a race car, I need some power in the lower section of my power band. I'm not sure about you...you seem like a dimwit kinda guy so that's what you probably do
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Last edited by Amini77; 08-28-2014 at 03:31 PM.
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      08-28-2014, 03:31 PM   #40
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Quote:
Originally Posted by b-man View Post
I think 3" is too much unless you're over 325hp. I'd go with 2.75

Good luck with whatever you decide! Let us know how it comes out
You're right, that's why I didn't go with 3". I went with 2.5" which is still an upgrade from stock, I'll still make power, but I didn't take too big of a risk going larger and I'm completely okay with that. I sure will, today I'm putting a resonator on, I think its still wayyyy too raspy for my taste.
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      08-28-2014, 06:16 PM   #41
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Because the area of the pipes is JUST under the surface area of a 3" pipe, with the exclusion of the section after the merge (resonator) is 3"

But tell me more about how you don't know how to measure, or the dynos YOU have found showing a loss of power with a single exhaust.
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      08-28-2014, 10:43 PM   #42
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Performance Exhaust - More Horsepower:
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      08-28-2014, 11:31 PM   #43
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AA 3inch race exhaust on a E36 M3. SO MUCH LOW END POWER LOSS.
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      08-29-2014, 04:32 AM   #44
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AA 3inch race exhaust on a E36 M3. SO MUCH LOW END POWER LOSS.
Showing me a dyno won't prove your point. Show me the link, I want to see his mods.
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