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11-25-2021, 02:49 PM | #1 |
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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. |
11-25-2021, 10:07 PM | #2 |
e91Owner
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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, 10:08 PM | #3 |
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11-25-2021, 11:21 PM | #4 |
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Don't expect much improvement in a base-level engine.
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12-31-2021, 02:09 AM | #5 |
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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!
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