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General E46 Forum
This is the place to get answers, opinions and everything you need related to your E46 (sedan, coupe, convertible and wagon) BMW!

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Old 02-23-2017, 10:17 PM   #21
Geo31
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Originally Posted by E46Envyy View Post
Dinan long tube CAI + AEM dry-flow filter.

Butt dyno says ~5whp

Just my 2 cents


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Butt dynos are horribly inaccurate and unreliable. NOBODY has a butt dyno calibrated to detect 5 hp.
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Old 02-23-2017, 10:30 PM   #22
E46Envyy
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Originally Posted by Geo31 View Post
Butt dynos are horribly inaccurate and unreliable. NOBODY has a butt dyno calibrated to detect 5 hp.


At the end of the day it's the butt dyno that puts a smile on my face, not numbers on a graph.

If anything I'd say throttle response is the biggest improvement.

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Old 02-23-2017, 10:48 PM   #23
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At the end of the day it's the butt dyno that puts a smile on my face, not numbers on a graph.

If anything I'd say throttle response is the biggest improvement.

Cheers


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Whatever tickles your butt....
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Old 02-24-2017, 12:57 AM   #24
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BMW left little to no headroom for performance increase by the end user. You will end up spending the kind of money that could have put you into a faster car to begin with. If the car's not fast enough for you stock you are going to be disappointed. Don't waste your time or money.
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Old 02-24-2017, 08:38 AM   #25
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A long tube intake and a Shark Injector will yield dyno-proven gains. Nothing drastic, but it will perk things up.

Headers offer the most bang for buck, but you have other issues to work around with them.

Forced induction will deliver the most substantial improvement (safely), but this is costly.
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Old 02-24-2017, 08:57 AM   #26
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But new gears huh? Good idea but I have an automatic, would it make a difference? If so what size gears?
Well if you've got an automatic I'd suggest upgrading to an M3 steering wheel. All you're doing is steering anyway...
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Old 02-24-2017, 01:10 PM   #27
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If you have an automatic, manual swap first. Provided your shifts aren't slow you'll actually have a quicker car. Plus, if you ever wanted to go F/I you'd need the manual gearbox to handle the power.

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[BMW Motors] Advertising has somehow convinced people that they're different. That they're made by magical Dachshunds who only eat special bratwursts made by virgins in an undisclosed magical spot inside of the black forest that can only be accessed via a special hydrogen powered BMW helicopter.
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Old 02-24-2017, 04:27 PM   #28
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If you have an automatic, manual swap first. Provided your shifts aren't slow you'll actually have a quicker car. Plus, if you ever wanted to go F/I you'd need the manual gearbox to handle the power.
The automatic is more durable than people give it credit for. Base level versions of SC kits are compatible with it and Technique Tuning, the only reputable shop that offers a turbo kit for the M54, also has options for the automatic.

I've looked into supercharging as well as a manual swap and always come to the same conclusion that I'm better off saving the time and putting aside the cash for a new car. Checked out an M240i today and was impressed...especially with how much power you can safely obtain from inexpensive bolt-ons. Definitely more drawn to the M2, but I'd like to see an engine update in the upcoming LCI first.
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Old 02-24-2017, 10:16 PM   #29
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Sh*t man you have a ZHP....good enough! Id just leave it alone as is. The mods youve done or the car had when you bought it are good enough. If you want an aggressive sound get the cat-back borla and call it a day.
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Old 04-08-2017, 04:14 PM   #30
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What about an underdrive pulley set? I've been thinking of this for my 2003 325i. I drive a lot of highway miles and actually think this will provide me some fuel economy as well.

Thoughts?
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Old 04-08-2017, 07:34 PM   #31
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Thanks for all the helpful info!! If anything I may just save up for a supercharger later on down the road but for now I'll just do headers, cat back exhaust and maybe software and just keep the stock air intake!!
Let me know if you go with the sport muffler. I would be interested in your stock ZHP muffler.
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Old 04-10-2017, 09:51 AM   #32
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i'm not much into modifications, but the consensus i've seen among the more reliable people here is that headers are the best upgrade
not!!!

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Old 04-10-2017, 09:59 AM   #33
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Headers for sure, I'm in Florida you could run straight pipes here and cops usually don't care lol and we don't have vehicle inspections for emissions or anything. But new gears huh? Good idea but I have an automatic, would it make a difference? If so what size gears?
Are you F'ing kidding me? Maybe you think it's cool to drive around with no mufflers and/or cats, I'm here to tell you, it's not! You should go buy a Honda Civic and put a huge wing on it.

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Old 04-10-2017, 10:08 AM   #34
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FWIW, my friend's S/C ZHP with catless headers
Catless headers won't pass emissions inspection, so unless you are building a race car; good luck with that.
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Old 04-10-2017, 10:12 AM   #35
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If you want real power, do everything I mentioned but get a supercharger as well. You won't be as quick as an M3, but you'll be close and probably quicker than an ///M vert.
Here's a better idea, save the $5000 in parts and go buy an M3.
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Old 04-10-2017, 10:14 AM   #36
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well if you've got an automatic i'd suggest upgrading to an m3 steering wheel. All you're doing is steering anyway...
wtf!?!
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Old 04-10-2017, 10:19 AM   #37
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If you have an automatic, manual swap first. Provided your shifts aren't slow you'll actually have a quicker car. Plus, if you ever wanted to go F/I you'd need the manual gearbox to handle the power.

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If you want a manual transmission, then buy a car with a manual transmission. Do you have any idea what is involved in changing a car from automatic to manual?
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