Cat back for 528i?

Jazerramos · 11-25-2021, 02:49 PM

In YOUR opinion, what's the best cat back exhaust system I should get for a bit better performance and air flow for bmw 528i 2008??

I currently got muffler delete but would like to move onto cat backs soon.

e91Owner · 11-25-2021, 10:07 PM

You might want to ask on the e90 mods forum. It'll be a different part number, but the same engine and the e60 board is basically dead.

Jazerramos · 11-25-2021, 10:08 PM

Quote:

Originally Posted by e91Owner

You might want to ask on the e90 mods forum. It'll be a different part number, but the same engine and the e60 board is basically dead.

Thanks bro

JayArras · 11-25-2021, 11:21 PM

Don't expect much improvement in a base-level engine.

mpathic · 12-31-2021, 02:09 AM

Put on a 535i or 550i muffler, and remove your resonator. Direct bolt-in to the same mounting points as you have already. Use 3" pipe from a y-connector behind the cats back to the muffler, leaving out the resonator. The resonator, and the smaller pipe diameter behind it, is the real flow restriction.
Muffler delete isn't effective if you leave the stock resonator and exiting 69mm pipe in place.
Or, put a y-connector behind the cats, and then a Flowmaster 3" diameter resonator under the middle of the car behind the cross-brace of the driveshaft tunnel where the original heavy resonator was, then 3" pipe out the back, with a tip of your choice.
hth!

11-25-2021, 02:49 PM	#1
Jazerramos New Member 0 Rep 5 Posts Drives: Bmw 528i 2008 Join Date: Aug 2021 Location: Bronx New York iTrader: (0)	Cat back for 528i? In YOUR opinion, what's the best cat back exhaust system I should get for a bit better performance and air flow for bmw 528i 2008?? I currently got muffler delete but would like to move onto cat backs soon.
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11-25-2021, 10:07 PM	#2
e91Owner e91Owner 425 Rep 1,129 Posts Drives: 2011 e91 & 2010 e60 Join Date: Mar 2018 Location: Out of the Office iTrader: (0)	You might want to ask on the e90 mods forum. It'll be a different part number, but the same engine and the e60 board is basically dead.
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11-25-2021, 11:21 PM	#4
JayArras Casual Fanatic 32 Rep 191 Posts Drives: '07 530xi Join Date: Oct 2010 Location: Fairfield County, CT iTrader: (0)	Don't expect much improvement in a base-level engine. __________________ 2007 530xi, Black Metallic Sapphire, 6 speed manual, Sport package, Cold Weather Package, Premium Package, Premium Sound Package, Sirius Satellite Radio, MTech front bumper, Replica Style 166 wheels
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12-31-2021, 02:09 AM	#5
mpathic First Lieutenant 35 Rep 310 Posts Drives: Z4 MCoupe,3.0Si R,E61 535xiT Join Date: Oct 2014 Location: California iTrader: (0)	Put on a 535i or 550i muffler, and remove your resonator. Direct bolt-in to the same mounting points as you have already. Use 3" pipe from a y-connector behind the cats back to the muffler, leaving out the resonator. The resonator, and the smaller pipe diameter behind it, is the real flow restriction. Muffler delete isn't effective if you leave the stock resonator and exiting 69mm pipe in place. Or, put a y-connector behind the cats, and then a Flowmaster 3" diameter resonator under the middle of the car behind the cross-brace of the driveshaft tunnel where the original heavy resonator was, then 3" pipe out the back, with a tip of your choice. hth! __________________ And you may ask yourself, "Where is that large automobile?"
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