645CI POWER LOSS WITH MAGNAFLOW
02-18-2009, 06:46 PM
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Originally Posted by tbal' post='796336' date='Feb 18 2009, 07:41 PM
Why do I get the hint you work for RPI or something Perhaps you get good discount? loool
lol because im the trend setter and he is buying what im buying jk
02-18-2009, 10:26 PM
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Originally Posted by Aviator' post='796340' date='Feb 18 2009, 07:45 PM
I obviously mean quad (tip) exhaust. I don't believe I've ever seen a full quad exhaust on anything other than an aircraft.
In another thread awhile back, someone was talking about not being a "true quad" exhaust... which is impossible like you said lol
02-18-2009, 10:27 PM
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Originally Posted by PraiseTheLowered' post='796341' date='Feb 18 2009, 07:46 PM
lol because im the trend setter and he is buying what im buying jk
But aren't you a follower?
02-19-2009, 12:08 AM
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Originally Posted by Jags545i' post='796200' date='Feb 18 2009, 11:46 PM
I got a magnaflow quad and am dreading my dyno now! 
02-19-2009, 08:47 AM
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Originally Posted by tbal' post='796235' date='Feb 19 2009, 01:11 AM
Really? I dont feel any lose of power.... My stock 645ci vs 335i i lost by a car length. When I raced again after the magnaflow exhaust I was neck n neck with the same car, same driver. I also did a KN drop in filter...
Did you take out the resonators? Do a xpipe? Change the piping size?
Did you take out the resonators? Do a xpipe? Change the piping size?
02-19-2009, 09:16 AM
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Originally Posted by tbal' post='796235' date='Feb 19 2009, 01:11 AM
Really? I dont feel any lose of power.... My stock 645ci vs 335i i lost by a car length. When I raced again after the magnaflow exhaust I was neck n neck with the same car, same driver. I also did a KN drop in filter...
Did you take out the resonators? Do a xpipe? Change the piping size?
Did you take out the resonators? Do a xpipe? Change the piping size?
02-19-2009, 01:36 PM
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hey stoneface, any info available from your dyno run? Just posting a peak number of increase or decrease doesn't really tell us anything. Do you have any ETs from a track, before and after?
02-20-2009, 05:22 AM
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I stoke with Magnaflow yesterday, they are making a specific exhaust for the 545i, it is still in testing, they said it may be out within the next month. Magnaflow for 545i
02-20-2009, 06:13 AM
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Originally Posted by rudeja' post='797548' date='Feb 20 2009, 08:22 AM
I stoke with Magnaflow yesterday, they are making a specific exhaust for the 545i, it is still in testing, they said it may be out within the next month. Magnaflow for 545i
As for your loss in HP, there's so much variables involved to even begin speculating. If you can measure the cfm from your stock exhaust (@ max rpm) compared your new exhaust setup, then we can start talking about flow and pressurization. From a bird's eye view, the stock muffs. are chambered and the magnas are preforated straight throughs. You may appear to have more flow, lowering the pressurization inside your exhaust system, and reducing the scavaging effects . . . resulting in a slight decrease in power.