12-15-2020, 09:21 PM | #23 | |
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12-15-2020, 09:27 PM | #24 | ||
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12-15-2020, 09:41 PM | #25 | |
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12-15-2020, 10:45 PM | #26 | ||
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01-04-2021, 10:17 PM | #27 |
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Update: had the vibrant resonator installed in the mid pipe and it helped clean up the sound a lot and I'm happy with the result for now! Cleaner sound and I'd say 15% volume reduction not much quieter but less rasp in the sound for sure. Hopefully my
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01-15-2021, 05:45 PM | #28 | |
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Now with the ER DP + AA exhaust (and I welded in the OEM valve to driver tip) it's perfect. |
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01-15-2021, 07:18 PM | #29 | ||
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01-15-2021, 09:16 PM | #30 | |||
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01-16-2021, 09:19 AM | #31 |
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This is my sequence of changes and experiences:
1) Did the AA cat back exhaust first. Has a nice raspy low throttle/low RPM sound, when you really lay into it, more of a "whoosh" than a growl. Honestly, initially it wasn't what I expected. I'm used to normally asperated higher higher cylinder count engines that just get insanely louder as you open it up. 2) Then decided I wanted a DP so I did the VSRF catted version. Fitment was brutal due to a manufacturing defect which placed the outlet at a weird angle. It was a 4" to 5" cat to 4" pipe that was really raspy and rough sounding. It ended up making the AA exhaust painful under light throttle/loud. When I was doing 40-50MPH going up a incline, you could feel the exhaust rasp through the drivers seat, glove box was rattling, etc. Cold start with the rear doors open just hurt your ears. 3) In the driveway I realized if I plugged on of the AA tips, this megaphone pain went away, so I welded the OEM flapper into the left AA outlet. Then it was perfect since that low RPM load/drone + cold start didn't make me regret life. 4) The VSRF went back since fitment was wrong, and I did the ER one. That DP is 4" through a 4" cat. It is MUCH more refined sound and nice and crisp. All in all, VERY happy with the ER + AA + OEM exhaust flap. If you get into the throttle a bit in sport, it gets louder, under cruise the flap closes and becomes tame and tolerable. During cruise it's still louder than OEM, somewhere around the volume as the fake active sound in sport, but without that annoying drone. |
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01-16-2021, 10:30 AM | #32 | |
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01-18-2021, 08:11 AM | #33 | |
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My 2017 M240i: MHD, xHP, Modded OE Intake, AA GESi 400 CPSI Cat DP, Dinan Mid-pipe, M Performance LSD & Rear Diffuser, BMS Exhaust Tips, Apex EC-7 Wheels, M-Tech Front Lip, iND Painted Mirror Caps, Smoked Reflectors
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01-18-2021, 05:40 PM | #34 | ||
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That's the one I had installed the 3" version. And thank you! |
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01-18-2021, 07:11 PM | #35 | |
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Long story short, I'm happy where all the cards landed, and a bit happy that the VSRF didn't work out (in my setup). My "assumption" is you probably want to stick with a cat the same size as the DP tube. VSRF went from 4" to 5" (same cell count) so the holes are bigger and it sounded bad. Maybe it flowed more, but it was loud and obnoxious to me. If you are doing the non-cat, then it really doesn't matter since it's just a straight pipe. |
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01-18-2021, 08:58 PM | #36 | ||
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01-19-2021, 08:56 AM | #37 | |
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My 2017 M240i: MHD, xHP, Modded OE Intake, AA GESi 400 CPSI Cat DP, Dinan Mid-pipe, M Performance LSD & Rear Diffuser, BMS Exhaust Tips, Apex EC-7 Wheels, M-Tech Front Lip, iND Painted Mirror Caps, Smoked Reflectors
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01-19-2021, 02:40 PM | #38 | ||
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