Will catless downpipes change my exhaust note that much?

///mfizzle · 07-17-2014, 10:53 AM

Hey guys,

I have an RPI full downpipe back exhaust on my car right now and I love the way it sounds.

I purchased the n54tuning catless downpipes a while back, but I've been hesitant to put them on in fear of ruining the way my car sounds now.

Everyone says different things. Some say it won't change the exhaust note much and will just make it louder, some say it will ruin the clean sound of the RPI exhaust and make the car drone like crazy.

It's my daily driver and I'm ok with it being louder. I just don't want it to completely change the way my exhaust sounds now. If that makes sense?

Let me know please!

Thanks

11SEC · 07-17-2014, 11:17 AM

Yes it will and for the better. Will induce rasp if you don't have resonators on the RPI

pwr hungry · 07-17-2014, 11:51 AM

It will get louder and if your exhaust is catless, you will get drone.

Cloud9blue · 07-17-2014, 12:21 PM

From my experience, slightly louder drone (stuff towels in the rear center storage to get rid of the rattlings from that sliding cover) and a slight rasp at full throttle. You also feel a bit more vibration at idle if AC is on. Not that bad in my opinion for a DD, but just don't leave the engine idling somewhere where there is very little ventilation

mike@x-ph.com · 07-17-2014, 02:20 PM

Yes

///mfizzle · 07-17-2014, 11:30 PM

Thanks for the fast replies guys. Sounds like I don't really want them haha I hate rasp and I hate drone :/

V8bait · 07-17-2014, 11:52 PM

Quote:

Originally Posted by ///mfizzle

Thanks for the fast replies guys. Sounds like I don't really want them haha I hate rasp and I hate drone :/

And you have downpipe back exhaust?

e92_enthusiast_1 · 07-18-2014, 12:10 AM

You'll want them once you see how much power gains a tune with them will get ya

///mfizzle · 07-18-2014, 12:47 PM

Quote:

Originally Posted by V8bait

And you have downpipe back exhaust?

Haha it's not that bad. The RPI cans in the rear keep it pretty clean sounding and I only get the rattle from the rear center counsel a little.

I figure the power gains are worth the extra drone and rasp so I'll go ahead and put them on. Hopefully it still sounds similar!

So far in mods I have:

Jb4
DCIs
HPF intercooler
RPI catless exhaust
N54tuning 3" Catless DPs

What do you think I'm looking at horespower wise? Maybe 360ish wheel?

I need to get this thing on a dyno soon.

07-17-2014, 10:53 AM	#1
///mfizzle Private 21 Rep 67 Posts Drives: 09 E92 335i Join Date: Apr 2011 Location: Naples, FL iTrader: (0)	Will catless downpipes change my exhaust note that much? Hey guys, I have an RPI full downpipe back exhaust on my car right now and I love the way it sounds. I purchased the n54tuning catless downpipes a while back, but I've been hesitant to put them on in fear of ruining the way my car sounds now. Everyone says different things. Some say it won't change the exhaust note much and will just make it louder, some say it will ruin the clean sound of the RPI exhaust and make the car drone like crazy. It's my daily driver and I'm ok with it being louder. I just don't want it to completely change the way my exhaust sounds now. If that makes sense? Let me know please! Thanks
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07-17-2014, 11:17 AM	#2
11SEC Banned 5 Rep 254 Posts Drives: E92 335i Join Date: May 2014 Location: Canada iTrader: (0)	Yes it will and for the better. Will induce rasp if you don't have resonators on the RPI
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07-17-2014, 11:51 AM	#3
pwr hungry Banned 42 Rep 1,257 Posts Drives: 335 Join Date: Mar 2013 Location: Amer'ca iTrader: (2)	It will get louder and if your exhaust is catless, you will get drone.
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07-17-2014, 12:21 PM	#4
Cloud9blue Brigadier General 717 Rep 3,251 Posts Drives: around the potholes Join Date: Aug 2008 Location: NY/NJ/MA iTrader: (13)	From my experience, slightly louder drone (stuff towels in the rear center storage to get rid of the rattlings from that sliding cover) and a slight rasp at full throttle. You also feel a bit more vibration at idle if AC is on. Not that bad in my opinion for a DD, but just don't leave the engine idling somewhere where there is very little ventilation __________________ 09 BMW E92 335i: Top Mount EFR 7670 / Dinan / AP Racing / Wavetrac / TC Kline [Full Mod List] 07 BMW R1200S: Shine Yellow / Akrapovic / Ohlins 19 Volvo V90 T6: R-Design / Bowers & Wilkins / Polestar Optimization
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07-17-2014, 02:20 PM	#5
mike@x-ph.com BimmerPost Supporting Vendor 27339 Rep 196,672 Posts Drives: 07-335/12-328/18-M4/21-M4CP Join Date: Sep 2013 Location: Las Vegas iTrader: (23)	Yes __________________ Check out our current sale by clicking on this link! https://x-ph.com/sale/ Phone number 702-494-9435
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07-17-2014, 11:30 PM	#6
///mfizzle Private 21 Rep 67 Posts Drives: 09 E92 335i Join Date: Apr 2011 Location: Naples, FL iTrader: (0)	Thanks for the fast replies guys. Sounds like I don't really want them haha I hate rasp and I hate drone :/
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07-18-2014, 12:10 AM	#8
e92_enthusiast_1 Lieutenant Colonel 118 Rep 1,709 Posts Drives: '10 AW/CR e92 6mt 335i Join Date: Mar 2012 Location: Tempe, AZ iTrader: (1) Garage List 2010 BMW 335i [10.00]	You'll want them once you see how much power gains a tune with them will get ya
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