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Go Back   E46Fanatics > Tuning & Tech > Driveline, Engine & DME Tuning

Driveline, Engine & DME Tuning
Talk about driveline improvements, NA tuning and DME tuning your E46 BMW here. This includes diffs, intakes, exhausts, chips, software and OBD tuning.

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Old 09-09-2008, 11:24 AM   #1
Deadshot
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My Ride: 04' BMW 325i
Question 325i boost

hey guys so i have a 04' 325i auto, yeah i know i should of got a manual but the deal on this car was too good to pass by so i bought it and a M3 is way out of my budget. So i was wondering are there any mods i can do to improve hp and torque on it? i mean i know i wont get much improvement because its auto but i still want to be a little bit faster. Doesnt anyone know what the max i can peak out on performance and torque on an auto 325i? thanks!
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Old 09-12-2008, 01:47 AM   #2
Chris-TK
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There are only small mods that you can do to improve hp without forced induction.

Exhaust and cold air intake will yield minimal results. Headers will get your a bit more around 15hp. The best and cheapest way to get hp/torque is forced induction, don't even waste your time with the other small performance mods if you really want it to be faster.
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Old 09-15-2008, 02:44 AM   #3
fndrh1st
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do things like headers, cold air intake, and exhaust even yield ANY noticeable differences when driving?
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Old 09-15-2008, 03:00 AM   #4
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Originally Posted by fndrh1st View Post
do things like headers, cold air intake, and exhaust even yield ANY noticeable differences when driving?
Yes they're noticeable in the low and high ends. But if you want REAL power you have to go forced induction.
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Old 10-02-2008, 09:03 PM   #5
Sev21
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well how about modding a 98 3 manual with an 01-04 auto 3? simsima told deadshot that it would be better to have a manual 325/30 for any mods to be realize (felt). is this true and if so, how come the manual would yeild better performance from the upgrades?
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Old 10-04-2008, 03:33 PM   #6
Asbjorn@ESS
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Headers make minimal difference below 300rwhp on the M54, stock airbox on the 325 is very good.
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Old 10-04-2008, 08:47 PM   #7
pbfanatic321
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Originally Posted by christkharris View Post
There are only small mods that you can do to improve hp without forced induction.

Exhaust and cold air intake will yield minimal results. Headers will get your a bit more around 15hp. The best and cheapest way to get hp/torque is forced induction, don't even waste your time with the other small performance mods if you really want it to be faster.
Sorry for this really bad question but whats forced induction?
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Old 10-04-2008, 09:04 PM   #8
Chris-TK
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Sorry for this really bad question but whats forced induction?
Forced induction = supercharger or turbocharger
NA = naturally aspirated, not forced induction
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