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Forced Induction Forum Sponsored by Active Autowerke
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Old 12-23-2013, 10:42 AM   #1
straight_beamin
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AA stage 2 kit 323i, couple questions :)

So i have a stage 2 hks kit for my little 323i. I had it up for sale but have decided to keep it and enjoy it.

I have a 3.46 installed in the rear end. Is this going to be too aggressive for the car with the kit? I dont do so much highway driving and it makes the car peppy around the city.

Also i am totally new to forced induction. I know with turbos an upgraded exhaust system helps a ton. Is it similiar with superchargers?

I have catless ebay headers installed and pretty much just straightpipe magnaflow with one resonator. I know every car is different, AA states 340hp at the crank on a stock car... what can i expect with catless headers and exhaust? Just a few ponies or will it be a big help.

Should i get the blower inspected (bought used) before installing, everything seems clean and blower spins and doesnt seem to be seized or anything.


Thanks for helping a noob out

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Old 12-23-2013, 07:28 PM   #2
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Go to a performance shop that works with superchargers and get them to test the blower. If it has play or is not working right you can save yourself a headache. I wouldn't imagine a rebuild would be more than $400.00. I am actually going through the same thing you are. I just bought a used kit last week.
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Old 12-23-2013, 08:30 PM   #3
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good idea, just want to find someone local
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Old 12-24-2013, 09:42 AM   #4
straight_beamin
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Re: AA stage 2 kit 323i, couple questions :)

Any idea on power with catless headers and straight pipe exhaust?

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Old 12-24-2013, 09:48 AM   #5
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With a supercharger it would make more power than the stock exhaust. If you don't run FI you will lose some Torque down low. I have catless headers which I gained horsepower with and when I added the 3" exhaust I didn't lose any power but only might have gained a few horsepower. 3" would be overkill for NA non M car. I would go to a single 2.5" if thats the case.

Also I wouldn't run pure straight pipe. I have to straight through muffles in my 3" so it doesn't drone and is not obnoxious.
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Old 12-24-2013, 10:07 AM   #6
straight_beamin
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Re: AA stage 2 kit 323i, couple questions :)

It is 2.5 inch dual then halfway there is a y pipe to a single 2.5 inch pipe then resonator and magnaflow muffler on the end

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Old 12-24-2013, 11:34 AM   #7
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Usually with a SC you don't want such a low (numerically high) diff because you want to keep car under boost longer to reap its benefits.

I am really doubting AA's claim of 340hp at the crank for a 323 which comes with 170HP stock. I had the same car which was also supercharged and it made nowhere near 340hp with the SC, exhaust, Schrick cams etc... Not even close.

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Old 12-24-2013, 12:25 PM   #8
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The headers will give you good gains but as long as you got that resonator in there, it shouldnt be too raspy on your 323.

I would expect it to dyno somewhere around 260 rwhp or more with headers.


As for the rear end, it might be too aggressive for a 5 speed. I went from a 2.91 to 3.46 and settled on a 3.07 off a zhp on my old 5 speed ESS 330ci.

3.15 would be a good upgrade too without making the engine feel high strung due to gearing
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Old 12-24-2013, 01:40 PM   #9
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Re: AA stage 2 kit 323i, couple questions :)

Ok, thanks for all input. I believe i did see actives dyno on a stock at 267whp so even that would be awesome plus maybe 10 with the headers.

As for gearing, 3.15 would probably be the best choice as mentioned. Any idea what car it comes out of?

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Old 12-25-2013, 10:58 AM   #10
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I would say 280ish whp with the headers at 8-9 PSI, I had a ASA tm-12 kit few years back and at 9 psi with headers/3.46 quaife LSD diff I made 295 whp and 290 wtrq, my car was also a 323 but coupe, I loved my 3.46 diff with the 5 spd
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Originally Posted by straight_beamin View Post
Ok, thanks for all input. I believe i did see actives dyno on a stock at 267whp so even that would be awesome plus maybe 10 with the headers.

As for gearing, 3.15 would probably be the best choice as mentioned. Any idea what car it comes out of?

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Old 12-25-2013, 11:21 AM   #11
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Originally Posted by straight_beamin View Post
It is 2.5 inch dual then halfway there is a y pipe to a single 2.5 inch pipe then resonator and magnaflow muffler on the end

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With a supercharged I would use a y merger directly from the headers to a 3" exhaust using a resonator muffler in the missed and a 18" muffler at the rear. It doesn't sound to loud at all and will be perfect for a FI setup. I am using two magnaflow mufflers on my 3" and it sounds amazing
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Old 12-25-2013, 01:10 PM   #12
straight_beamin
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Originally Posted by 323tom View Post
I would say 280ish whp with the headers at 8-9 PSI, I had a ASA tm-12 kit few years back and at 9 psi with headers/3.46 quaife LSD diff I made 295 whp and 290 wtrq, my car was also a 323 but coupe, I loved my 3.46 diff with the 5 spd

that is awesome... the car will be a ton more fun then before no doubt which is what I am looking for. plus I will be able to hang with some faster (from factory) cars which is also nice
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Old 12-26-2013, 11:06 AM   #13
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Quote:
Originally Posted by straight_beamin View Post
So i have a stage 2 hks kit for my little 323i. I had it up for sale but have decided to keep it and enjoy it.

I have a 3.46 installed in the rear end. Is this going to be too aggressive for the car with the kit? I dont do so much highway driving and it makes the car peppy around the city.

Also i am totally new to forced induction. I know with turbos an upgraded exhaust system helps a ton. Is it similiar with superchargers?

I have catless ebay headers installed and pretty much just straightpipe magnaflow with one resonator. I know every car is different, AA states 340hp at the crank on a stock car... what can i expect with catless headers and exhaust? Just a few ponies or will it be a big help.

Should i get the blower inspected (bought used) before installing, everything seems clean and blower spins and doesnt seem to be seized or anything.


Thanks for helping a noob out

Sent from BimmerApp mobile app
Glad to see you have our HKS Kit running on your E46. Upgrading to Catless headers and Performance Exhaust will add some extra ponies that have been held back from the Factory Headers. Make sure you have sufficient fluid for your Blower lack of lubrication can cause the blower to seize up. Please feel free to shoot me a PM or contact me directly.
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