Downpipes

GTM_Challenge · 02-21-2013, 09:46 AM

Quote:

Originally Posted by J-boogey

sounds good, the catless one probably sounds louder too, I called challenge today but there out of stock on the catless =(

We'll have some more done here soon. We just had to catch up on some m3 production here first. Catless downpipes have been selling less than the HFC ones, so we initially made less to match demand.

mikew2069 · 02-21-2013, 10:09 AM

Quote:

Originally Posted by GTM_Challenge

Mike,

We really appreciate you taking the time to do that video for the guys here. Car sounds great!

You got it man! It was fun... and the drive to work today was even better!

mikew2069 · 02-23-2013, 10:13 AM

I was bored this morning since my kids were sleeping in and decided to unplug the sensor that controls the left exhuast flap and make another video. It really smoothed out the cold start but seemed to quiet the idle. Not sure if I prefer it or not but I'm going to drive like this for a couple of days and might plug it back in...

mikew2069 · 02-23-2013, 10:19 AM

Also, here are more pics to compare the stock DP and Challenge DP. You can really see how big, dumb, and restrictive the stock cat is...

IMG_9994 by mikew2069, on Flickr

IMG_9993 by mikew2069, on Flickr

IMG_9992 by mikew2069, on Flickr

Jeff_in_Oviedo · 02-23-2013, 11:55 AM

I would be interested in seeing some flowbench results to actually measure the back pressure at various flow levels. If the stock cat is bigger, then there are more pathways through it for the exhaust to flow.

shivaswrath · 02-23-2013, 12:12 PM

Quote:

Originally Posted by mikew2069

Also, here are more pics to compare the stock DP and Challenge DP. You can really see how big, dumb, and restrictive the stock cat is...

IMG_9994 by mikew2069, on Flickr

IMG_9993 by mikew2069, on Flickr

IMG_9992 by mikew2069, on Flickr

great pics, thanks for sharing!
Any CELs with this one? It looks VERY stock, it might be a great purchase for me, I just don't want to deal with a piggyback since I've got an extended warranty....

NICKTENN · 02-23-2013, 01:51 PM

Mike, was there a noticeable weight difference?

shivaswrath · 02-23-2013, 02:16 PM

Quote:

Originally Posted by NICKTENN

Mike, was there a noticeable weight difference?

great point...the stock one looks like a honking huge piece of metal!

mikew2069 · 02-23-2013, 04:54 PM

Quote:

Originally Posted by NICKTENN

Mike, was there a noticeable weight difference?

Quote:

Originally Posted by shivaswrath

great point...the stock one looks like a honking huge piece of metal!

Interesting that you would ask b/c I weight EVERYTHING. But I do have a shatty scale so that's my disclaimer but hopefully the difference is acurate enough. The Challenge HFC DP weighed in at 4.5lbs and the stock DP was 7.8lbs. So about a 45% savings.

dgzill · 02-23-2013, 06:28 PM

great posts...DP def sounds well worth the money! I'm hesitant of the CEL and voiding my Warranty...the warranty is the main reason I bought a brand new BMW.

nsquared · 02-24-2013, 12:18 PM

Quote:

Originally Posted by mikew2069

Here's a video I made w/ before and after. It's kind of long but it's all about the details!

Awesome video. Thanks so much.

nsquared · 02-24-2013, 12:24 PM

Quote:

Originally Posted by mikew2069

Interesting that you would ask b/c I weight EVERYTHING. But I do have a shatty scale so that's my disclaimer but hopefully the difference is acurate enough. The Challenge HFC DP weighed in at 4.5lbs and the stock DP was 7.8lbs. So about a 45% savings.

Thats good news. Mike, how is the cabin ride w/ the HFC dp? Any louder in the cabin?

mikew2069 · 02-24-2013, 03:47 PM

There are certain times in the cabin under specific acceleration or rpms that you can tell a difference but its NOT an issue or a deal breaker. It's very suttle nice to hear.

The reason I haven't bought a catback yet is b/c I probably have a customer ride w/ me once or twice a month and this car can NOT be loud or abnoxious in the cabin. This DP doesn't even come close to that.

nsquared · 02-24-2013, 04:21 PM

Quote:

Originally Posted by mikew2069

There are certain times in the cabin under specific acceleration or rpms that you can tell a difference but its NOT an issue or a deal breaker. It's very suttle nice to hear.

The reason I haven't bought a catback yet is b/c I probably have a customer ride w/ me once or twice a month and this car can NOT be loud or abnoxious in the cabin. This DP doesn't even come close to that.

Makes sense. I also do not want a cat-back atm. I think I'm going to try a muffler delete first, then do HFC dp and if its too loud then I'm going to go back to stock muffler w/ aftermarket tips + HFC dp. Probably have it plugged in too unless you think its better to have it unplugged.

mikew2069 · 02-24-2013, 04:28 PM

Quote:

Originally Posted by nsquared

Makes sense. I also do not want a cat-back atm. I think I'm going to try a muffler delete first, then do HFC dp and if its too loud then I'm going to go back to stock muffler w/ aftermarket tips + HFC dp. Probably have it plugged in too unless you think its better to have it unplugged.

I really WANT the Challenge catback but I just don't know if its practical for me and my needs. I think the muffler delete will be loud as all hell inside! I'm still on the fence about the plug. Start up is much better though!

m5 guy · 02-24-2013, 04:35 PM

Quote:

Originally Posted by mikew2069

Quote:

Originally Posted by nsquared

Makes sense. I also do not want a cat-back atm. I think I'm going to try a muffler delete first, then do HFC dp and if its too loud then I'm going to go back to stock muffler w/ aftermarket tips + HFC dp. Probably have it plugged in too unless you think its better to have it unplugged.

I really WANT the Challenge catback but I just don't know if its practical for me and my needs. I think the muffler delete will be loud as all hell inside! I'm still on the fence about the plug. Start up is much better though!

That's one reason why I'm liking my meisterschaft so much. The ability to go from stock sound levels to wake the dead loud and any volume in between is great. Might want to look into it.

shivaswrath · 02-24-2013, 06:50 PM

love the pop in sport with the HFC DP...godamn it's tempting.

Any CELs yet? I know I keep asking, but I realize it probably takes 2 tanks of gas for the ECU to cycle.

nsquared · 02-24-2013, 09:16 PM

So I deleted my muffler. Haven't completed my custom muffler setup yet but it sounds amazing. The drone is an issue but hoping to fix that w/ the custom setup I'm thinking.

NICKTENN · 02-27-2013, 11:58 AM

Quote:

Originally Posted by mikew2069

There are certain times in the cabin under specific acceleration or rpms that you can tell a difference but its NOT an issue or a deal breaker. It's very suttle nice to hear.

The reason I haven't bought a catback yet is b/c I probably have a customer ride w/ me once or twice a month and this car can NOT be loud or abnoxious in the cabin. This DP doesn't even come close to that.

Any chance of an in cabin video??

mikew2069 · 02-27-2013, 12:13 PM

Quote:

Originally Posted by NICKTENN

Any chance of an in cabin video??

The change of sound in cabin is so minimal, I wouldn't be able to capture it on a video camera.

m5 guy · 02-27-2013, 12:19 PM

You'll be fine NICKTENN, go for it!

NICKTENN · 02-27-2013, 12:43 PM

Literally just got a flat tire (back drivers side), there goes $300

02-23-2013, 10:13 AM	#25
mikew2069 Lieutenant Colonel 413 Rep 1,975 Posts Drives: F30 335i MSport Join Date: Oct 2012 Location: Houston iTrader: (2)	I was bored this morning since my kids were sleeping in and decided to unplug the sensor that controls the left exhuast flap and make another video. It really smoothed out the cold start but seemed to quiet the idle. Not sure if I prefer it or not but I'm going to drive like this for a couple of days and might plug it back in... __________________ 2013 F30 335i ///M-Sport *Forgestar/Challenge/BMS JB4* *Wagner/Evo Race/M-Performance* 2016 F15 50i ///M-Sport *BM3/H&R/Borla*
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02-23-2013, 10:19 AM	#26
mikew2069 Lieutenant Colonel 413 Rep 1,975 Posts Drives: F30 335i MSport Join Date: Oct 2012 Location: Houston iTrader: (2)	Also, here are more pics to compare the stock DP and Challenge DP. You can really see how big, dumb, and restrictive the stock cat is... IMG_9994 by mikew2069, on Flickr IMG_9993 by mikew2069, on Flickr IMG_9992 by mikew2069, on Flickr __________________ 2013 F30 335i ///M-Sport *Forgestar/Challenge/BMS JB4* *Wagner/Evo Race/M-Performance* 2016 F15 50i ///M-Sport *BM3/H&R/Borla*
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02-23-2013, 11:55 AM	#27
Jeff_in_Oviedo Delivered! 13 Rep 139 Posts Drives: '13 F30 335 M Sport Join Date: Feb 2013 Location: Oviedo, FL iTrader: (0)	I would be interested in seeing some flowbench results to actually measure the back pressure at various flow levels. If the stock cat is bigger, then there are more pathways through it for the exhaust to flow. __________________ Delivered!: 2013 F30 335i M Sport, 8-speed Sport Trans, Estoril Blue/Coral Red, 403M, Premium Pkg, Dynamic Handling Pkg, Driver Assist Pkg, HK Sound, Enhanced BT & USB
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02-23-2013, 01:51 PM	#29
NICKTENN Second Lieutenant 55 Rep 265 Posts Drives: 340i M Sport Join Date: Mar 2012 Location: Suburb of Tampa FL iTrader: (0) Garage List 2016 BMW 340i M Sport [0.00]	Mike, was there a noticeable weight difference? __________________ 2016 340i M Sport Alpine White, BMS Intake, JB4 Beta 2012 335i Sport Line, RIP
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02-23-2013, 06:28 PM	#32
dgzill Private 4 Rep 47 Posts Drives: 2013 BMW 328i Join Date: Dec 2012 Location: Niceville FL iTrader: (0)	great posts...DP def sounds well worth the money! I'm hesitant of the CEL and voiding my Warranty...the warranty is the main reason I bought a brand new BMW. __________________ *2013 328i 6mt Sport Line*
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02-24-2013, 03:47 PM	#35
mikew2069 Lieutenant Colonel 413 Rep 1,975 Posts Drives: F30 335i MSport Join Date: Oct 2012 Location: Houston iTrader: (2)	There are certain times in the cabin under specific acceleration or rpms that you can tell a difference but its NOT an issue or a deal breaker. It's very suttle nice to hear. The reason I haven't bought a catback yet is b/c I probably have a customer ride w/ me once or twice a month and this car can NOT be loud or abnoxious in the cabin. This DP doesn't even come close to that. __________________ 2013 F30 335i ///M-Sport *Forgestar/Challenge/BMS JB4* *Wagner/Evo Race/M-Performance* 2016 F15 50i ///M-Sport *BM3/H&R/Borla*
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02-24-2013, 06:50 PM	#39
shivaswrath Brigadier General 649 Rep 4,323 Posts Drives: 2012 335i Join Date: Apr 2008 Location: Lost in NJ iTrader: (3)	love the pop in sport with the HFC DP...godamn it's tempting. Any CELs yet? I know I keep asking, but I realize it probably takes 2 tanks of gas for the ECU to cycle. __________________ CURRENT: 2017 RS3 (miss you guys) SOLD: 2012 335i Mineral Gray M Performance Exhaust/Brakes/Suspension/LSD\|Bav Stage 1/AMP\|\|ER CP/IC/DP/OC \| Dinan CAI/N55 PWG BIG TURBO\|BMWF30.com
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02-24-2013, 09:16 PM	#40
nsquared [Versatile] 376 Rep 1,683 Posts Drives: (S)LOW. Join Date: Jun 2011 Location: California & Utah iTrader: (2)	So I deleted my muffler. Haven't completed my custom muffler setup yet but it sounds amazing. The drone is an issue but hoping to fix that w/ the custom setup I'm thinking. __________________ '02 TS E46 330xi - SOLD '06 SGM E90 325i - SOLD '13 AW F30 335i ///M-Sport 6MT. OEM(+) - SOLD '20 AW F87 X3MC - Sold Current: `23 Chalk G80 M3CX \| Ordered: '24 M3CS - Week37 build.
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02-27-2013, 12:19 PM	#43
m5 guy Brigadier General 1690 Rep 3,200 Posts Drives: 2020 M5 Comp Join Date: Apr 2012 Location: Hawaii iTrader: (14)	You'll be fine NICKTENN, go for it! __________________ 2020 F90 M5 Comp Oxford Green Metallic II-Aragon JOURNAL 2016 F10 M5 Space Gray-Black SOLD 2012 E70 X5M Monte Carlo Blue-Silverstone SOLD 2001 E46 M3 Oxford Green Metallic II-Cinnamon SOLD
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02-27-2013, 12:43 PM	#44
NICKTENN Second Lieutenant 55 Rep 265 Posts Drives: 340i M Sport Join Date: Mar 2012 Location: Suburb of Tampa FL iTrader: (0) Garage List 2016 BMW 340i M Sport [0.00]	Literally just got a flat tire (back drivers side), there goes $300 __________________ 2016 340i M Sport Alpine White, BMS Intake, JB4 Beta 2012 335i Sport Line, RIP
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