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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 04-06-2013, 10:34 PM   #1
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Magnaflow exhaust questions

So I'm thinking of purchasing a magnaflow exhaust system for my 2001 bmw 325ci. As of now, they only mods I have to the car are: tinted windows, a coilover kit, carbon black grill inserts, xenon sidelights, and angel eyes. I'm not as experienced with engine mods, etc.. So I was just wondering how many extra horses I would get out of the magnaflow kit compared to the stock exhaust system, if Ill even get any extra horses at all.
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Old 04-06-2013, 10:41 PM   #2
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Old 04-06-2013, 11:11 PM   #3
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you won't get anything out of it really. but the entire exhaust will be a heck of a lot lighter than the stock one. and it'll sound good.
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Old 04-12-2013, 01:16 PM   #4
Jim Murphy
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HP comes from replacing the main choke point - the header/cat with Magnaflow's improved replacement. Look at an OEM version and you will quickly see why. This assumes that the cats are required.

Cat back exhaust benefit:
NA cars = lighter weight and sound only as OEM flows okay
FI cars = more HP when ideal back pressure is found.

Search and learn before you spend your money.

Last edited by Jim Murphy; 04-12-2013 at 01:19 PM.
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Old 04-28-2013, 12:41 PM   #5
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Kind of late but I currently have the catback magnaflow exhaust which cost me like $750. Did not notice anything performance-wise but I definitely enjoy the sound of my car despite having an leak cause i somehow broke one of the studs off... Everything is bolt on too so you can just do everything in your garage yourself also.
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