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E60 / E61 (2004 - 2010)
BMW 5-Series E60 Sedan was first seen in the Unites States in the fall of 2003 with a 2004 Model Year designation. The E61 wagon followed shortly there after. The E60/E61 5 series is now available as a 528i, 528xi, 535i, 535xi, 550i and a 535xi sports wagon! -- View the E60 Wiki

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  #1  
Old 03-21-2013, 04:58 PM
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Axle back vs Cat back exhaust

Hi Friends

I am currently in look out for an exhaust, Please help me understand which one is better for a twin turbo, Axle back or Cat back exhaust?

Does the Axle back exhaust give any Hp/TQ gains?

Will the Axle back produce too loud sound and is it legal for street driving?

Thank you in advance
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  #2  
Old 03-21-2013, 05:29 PM
pjinca pjinca is offline
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Can't answer which is better for a turbo car, but the other questions, no problem:
Axle back does give HP/TQ gains, just typically less than a full catback system would.
Catback systems will tend to be louder, since they are more free flowing than an axle back, so they may attract more attention from law enforcement
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  #3  
Old 03-21-2013, 07:14 PM
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Quote:
Originally Posted by pjinca View Post
Can't answer which is better for a turbo car, but the other questions, no problem:
Axle back does give HP/TQ gains, just typically less than a full catback system would.
Catback systems will tend to be louder, since they are more free flowing than an axle back, so they may attract more attention from law enforcement
Thanks Pjinca..

Does 535i stock have a free flowing exhaust? If not, by adding an axle back will the restricting be more... I see many 535i owners go for catback which is a free flow releasing all the restriction and providing smooth flow and gain more Hp..

If that is the case what is the real benefit of axleback exhaust..

Please clarify?
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Old 03-21-2013, 11:20 PM
AlterZgo AlterZgo is offline
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Benefit of axle back exhaust is sound primarily.

Coming from a 335is, my 535i is super quiet which, IMO, means the stock 535i exhaust is probably more restrictive than that on my BMW 535i. With the extensive list of mods you have, I would definitely go with axle back exhaust to maximize your existing intake and exhaust mods. Since you have catted DPs, the noise shouldn't be ridiculously loud.
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Old 03-22-2013, 05:39 AM
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In my opinion Cat back is better, it will give more gains, but the sound will be louder.
axle back will give very little gains compared to cat back.
I think the difference between the two is just one less resonator.
And when it comes to the noise, its like based on the officer, some care to give tickets and some don't.
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Old 03-22-2013, 08:21 AM
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Thank you, i'll probably go with Axle back exhaust..

Plan is to get the exhaust by mid of April.. I'll keep evryone posted.. Thank you all as always
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