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BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST > 2012-2019 BMW 3 and 4-Series Forums > General F30 Sedan / F32 Coupe / F36 Gran Coupe Forum > 435ix Gran Coupe Exhaust or no Exhaust
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      06-14-2019, 12:18 PM   #1
JLBimmer
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435ix Gran Coupe Exhaust or no Exhaust

SO I had a custom muffler shop replace my stock exhaust withe a Mahna Flow an some tips. Come to realize that the factory exhaust for the 435 ix was already straight through with no chamber. I feel like I wasted my money now.

From the Factory the rear exhaust goes straight into a muffler then splits "Y" to a left and right exit. it is 3" pipe mated to a 2.5" piep. This is actually pretty efficient but doesnt sound great. My new muffler sounds great but didnt change the car's performance any bit IMO. The only thing left was to go full on muffler delete but I felt that would be too loud at the stop light.

Anyone else see a benefit in a custom axleback exhaust for thr 4351x Gran Coupe?
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      06-15-2019, 07:46 PM   #2
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You are just getting sound with the axle back. Expect no measurable performance gains.
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      06-15-2019, 07:56 PM   #3
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I did not read this post... just the tittle... so I vote for NO EXHAUST... just remove it from the cat and just leave it like that
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      06-15-2019, 08:15 PM   #4
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Quote:
Originally Posted by Gen13 F36 View Post
I did not read this post... just the tittle... so I vote for NO EXHAUST... just remove it from the cat and just leave it like that
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      06-16-2019, 09:12 AM   #5
Eddien123
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I'm confused. The stock exhaust is most definitely not straight through. An axle back makes a dramatic difference in sound. You're not going to notice a performance difference unless you go catless and a tune to go with it.
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      06-19-2019, 01:13 AM   #6
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No added performance from the exhaust, but a REMUS axle back will get you a very nice sound upgrade
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      06-19-2019, 03:25 AM   #7
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I'm voting for with EXHAUST, but you MUST like the sound. If it does not give you pleasure, what's the point at all.
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