HPF Exhaust GROUPBUY!!!! - Page 16 - BMW 1 Series Coupe Forum / 1 Series Convertible Forum (1M / tii / 135i / 128i / Coupe / Cabrio / Hatchback) (BMW E82 E88 128i 130i 135i)

Everfly · 04-24-2012, 12:43 PM

Quote:

Originally Posted by mineo77

We can dyno but my car is pretty modified already so wont yield the best results, esp since its a huge PIA to swap to stock DP's / exhaust and compare to this one, mainly cause I am way too lazy to lug all my OE shit to HPF to do this dyno. With any exhaust it will increase flow and increase HP a bit, but no exhaust is going to really do too much for HP. This exhaust is to supplement other mods so it increases efficiency to all the mods you got.

I don't think it's hard to find a stock car coming for dyno with this exhaust set up. I am pretty sure someone local will volunteer though.

mineo77 · 04-24-2012, 01:13 PM

Quote:

Originally Posted by Everfly

I don't think it's hard to find a stock car coming for dyno with this exhaust set up. I am pretty sure someone local will volunteer though.

I will leave that option to HPF to decided if they want to do that. Like I mentioned, dyno'd exhaust dont really give us any information.

Everfly · 04-24-2012, 01:19 PM

Quote:

Originally Posted by mineo77

Like I mentioned, dyno'd exhaust dont really give us any information.

WHY NOT?
RE dyno their axle back and gain 9rwhp over stock. That's very impressive for just axle back.

mineo77 · 04-24-2012, 02:25 PM

Quote:

Originally Posted by Everfly

WHY NOT?
RE dyno their axle back and gain 9rwhp over stock. That's very impressive for just axle back.

exhaust isnt really a go-fast modification, it is to allow your go-fast mods to work more efficiently. straight up exhaust alone will just make you sound fast.

calhounboi · 04-24-2012, 03:30 PM

Seriously? I have personally dyno'd my previous car before and after exhaust (same day)and gained almost 20whp. If this exhaust is eliminating 2 cats for us n54 guys and eliminating the rear muffler......there should be signifigant hp gains. Not to mention less bends and the 3.5" piping. Exhausts DO make power on turbo cars. If I see proof that the factory exhaust flows well enough that even this system doesn't show gains then I'll just stay stock. $1500 for no results on the dyno? I don't think so

Mr. Nice · 04-24-2012, 04:33 PM

the major choking points are the primary cats, biggest gains in exhaust system will be seen by switching to catless downpipes. I'd imagine on the 135 we'd see maybe a 15whp gain with this exhaust. You don't buy an exhaust for power on these cars, everyone should know that by now.

calhounboi · 04-24-2012, 05:25 PM

If that's the case then I don't see any reason to buy a full exhaust when you can get an axleback for weight savings and sound for 1/3 the price. That's just my opinion tho. Doesn't seem right that a 3.5" straight pipe should cost over $1500 and only give 15hp, but I do believe you. Guess I'm done looking at exhausts

Black Sheep · 04-24-2012, 05:47 PM

This exhaust will save you 40lbs dont forget that.

BMW86 · 04-24-2012, 06:02 PM

Quote:

Originally Posted by Everfly

I don't think it's hard to find a stock car coming for dyno with this exhaust set up. I am pretty sure someone local will volunteer though.

I'm not sure why anyone would want to see the delta from this exhaust on a stock tune. The majority of this forum are running some kind of tune and bolt-on's parts don't make a great deal of power on stock boost levels anyway.

Everfly · 04-24-2012, 06:09 PM

Quote:

Originally Posted by BMW86

I'm not sure why anyone would want to see the delta from this exhaust on a stock tune. The majority of this forum are running some kind of tune and bolt-on's parts don't make a great deal of power on stock boost levels anyway.

Some people just go for the sound and looks

I would say 40% maybe? I love those burn tips special adjustable since I could not find any axle back to sit flus with the CF diffuser. Also 15rwh is good to have

Mr. Nice · 04-24-2012, 07:10 PM

Allowing the turbos to spool more efficiently is invaluable, especially if you plan on upgrading them in the future

BBBluey · 04-24-2012, 10:01 PM

how about 0-60 times comparison? less weight and more efficient spool should improve it what...? Was this exhaust more for preperation of the supposed N54 change to HPF single turbo?

mineo77 · 04-25-2012, 11:58 AM

So there are a lot of varied response here to address. First off if you buy exhaust purely for HP increase and are not planning to do anything else you will be disappointed. The purpose for ANY exhaust system is to create more flow, less back pressure, and increase efficiency of other mods. Its not a 1:1 comparison depending on your modifications etc. The HPF exhaust is NOT for those just looking for a different sound, it was specifically developed for those with other modifications and for the signel turbo kit. The short comings are the DP's and if you want "big" gains from an exhaust you need to remove your cats. 0-60 times are not very important to folks so you dont see a lot of that out there with exception of the manufacturer of your car. So if you want all show no go, then save your $$ and get an axle back. If you are looking to supplement your other mods then the HPF is a no brainer. it is $$, but its not for everyone.

calhounboi · 04-25-2012, 08:59 PM

Axle back for all show no go? You said in your last post that an exhaust isn't a "go fast" mod and others have stated this full system shouldn't show much power gains. So how is it better than an axle back? I think that if this exhaust DOES "create more flow, less back pressure, and increase efficiency of other mods" then we should see power gains. Especially on a car that already has intakes, dp's, and increased boost. What am I missing here?

mineo77 · 04-25-2012, 10:09 PM

Quote:

Originally Posted by calhounboi

Axle back for all show no go? You said in your last post that an exhaust isn't a "go fast" mod and others have stated this full system shouldn't show much power gains. So how is it better than an axle back? I think that if this exhaust DOES "create more flow, less back pressure, and increase efficiency of other mods" then we should see power gains. Especially on a car that already has intakes, dp's, and increased boost. What am I missing here?

I have no idea what you are missing here. My point was that if you have no mods, no tune then just get an axle back for a more aggressive sound. if you have mods and a tune that require more flow then you need to redo your exhaust and readapt your tune.

Grayson · 04-26-2012, 01:10 PM

What you're saying is straight forward, he just doesn't get it.

Can you comment on the application to an N55 and also the emission question asked earlier?

Really looking forward to this exhaust.

mineo77 · 04-26-2012, 02:00 PM

Quote:

Originally Posted by Grayson

What you're saying is straight forward, he just doesn't get it.

Can you comment on the application to an N55 and also the emission question asked earlier?

Really looking forward to this exhaust.

I dont think it has been test fitted on a N55,(would defer that to Kirk) wouldnt see any reason it would fit up the same way since the single DP diverges to 2 pipes into the midpipe. please remind me of hte emission question, couldnt find it.

ams109 · 04-26-2012, 10:00 PM

by adding spacers to the x brace for clearance isnt that going to make the x brace softer or something

kris09 · 05-07-2012, 12:09 PM

Any Updates????

evilstib · 05-07-2012, 10:10 PM

Quote:

Originally Posted by Black Sheep

This exhaust will save you 40lbs dont forget that.

Wasn't it 40 lbs off a 335i exhaust? Ours is 1/2 theirs....

bignico_05 · 05-08-2012, 09:33 AM

Quote:

Originally Posted by kris09

Any Updates????

+1

Mr. Nice · 05-16-2012, 08:25 AM

status?

04-24-2012, 05:47 PM	#338
Black Sheep A Zip an a Double Cup Drives: 2009 BMW 135i Join Date: Feb 2010 Location: McHenry, IL Posts: 4,418 iTrader: (5)	This exhaust will save you 40lbs dont forget that. __________________ Cobb PROTuned \| RB's \| AMS FMIC \| AR DP's \| HPF Exhaust \| CP-E DCI \| Apex Arc 8's \| 235/275 Star Specs \|

04-25-2012, 11:58 AM	#343
mineo77 Lieutenant Colonel Drives: 2010 135i,1989 PRO3,2001 530i Join Date: Aug 2009 Location: Portland,OR Posts: 1,928 iTrader: (2) Garage List 2010 135i coupe [3.78]	So there are a lot of varied response here to address. First off if you buy exhaust purely for HP increase and are not planning to do anything else you will be disappointed. The purpose for ANY exhaust system is to create more flow, less back pressure, and increase efficiency of other mods. Its not a 1:1 comparison depending on your modifications etc. The HPF exhaust is NOT for those just looking for a different sound, it was specifically developed for those with other modifications and for the signel turbo kit. The short comings are the DP's and if you want "big" gains from an exhaust you need to remove your cats. 0-60 times are not very important to folks so you dont see a lot of that out there with exception of the manufacturer of your car. So if you want all show no go, then save your $$ and get an axle back. If you are looking to supplement your other mods then the HPF is a no brainer. it is $$, but its not for everyone. __________________ 135i coupe  6MT  TiAg  ///M sport http://www.rhominnovations.com www.musicarNW.com www.unitedBMWonline.com

04-26-2012, 01:10 PM	#346
Grayson Heisenberg Drives: 2008 135i Join Date: Mar 2012 Location: Santa Cruz, CA Posts: 555 iTrader: (2)	What you're saying is straight forward, he just doesn't get it. Can you comment on the application to an N55 and also the emission question asked earlier? Really looking forward to this exhaust. __________________ AR Catless Downpipes \| Berk Full Street Exhaust \| HPF FMIC \| COBB AP \| aFe Magnum Stage 2 \| E93 M3 Front Sway Bar & Bushings \| Michelin Pilot Super Sports \| Hardwired Radar \| Eurotek BBS LM \| Schmiedmann LCI Blacklines \| BMW Performance: Spoiler, Diffuser, Shift Boot, E-Brake

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04-24-2012, 03:30 PM	#335
calhounboi Enlisted Member Drives: 2008 135i Join Date: Feb 2011 Location: Ga Posts: 39 iTrader: (0)	Seriously? I have personally dyno'd my previous car before and after exhaust (same day)and gained almost 20whp. If this exhaust is eliminating 2 cats for us n54 guys and eliminating the rear muffler......there should be signifigant hp gains. Not to mention less bends and the 3.5" piping. Exhausts DO make power on turbo cars. If I see proof that the factory exhaust flows well enough that even this system doesn't show gains then I'll just stay stock. $1500 for no results on the dyno? I don't think so

04-24-2012, 05:25 PM	#337
calhounboi Enlisted Member Drives: 2008 135i Join Date: Feb 2011 Location: Ga Posts: 39 iTrader: (0)	If that's the case then I don't see any reason to buy a full exhaust when you can get an axleback for weight savings and sound for 1/3 the price. That's just my opinion tho. Doesn't seem right that a 3.5" straight pipe should cost over $1500 and only give 15hp, but I do believe you. Guess I'm done looking at exhausts

04-24-2012, 10:01 PM	#342
BBBluey Captain Drives: very slow and courteous Join Date: Mar 2009 Location: Santa Maria, California Posts: 815 iTrader: (6)	how about 0-60 times comparison? less weight and more efficient spool should improve it what...? Was this exhaust more for preperation of the supposed N54 change to HPF single turbo?

04-25-2012, 08:59 PM	#344
calhounboi Enlisted Member Drives: 2008 135i Join Date: Feb 2011 Location: Ga Posts: 39 iTrader: (0)	Axle back for all show no go? You said in your last post that an exhaust isn't a "go fast" mod and others have stated this full system shouldn't show much power gains. So how is it better than an axle back? I think that if this exhaust DOES "create more flow, less back pressure, and increase efficiency of other mods" then we should see power gains. Especially on a car that already has intakes, dp's, and increased boost. What am I missing here?

04-26-2012, 10:00 PM	#348
ams109 Enlisted Member Drives: 135i n54 Join Date: Apr 2012 Location: Bahrain Posts: 47 iTrader: (0)	by adding spacers to the x brace for clearance isnt that going to make the x brace softer or something

05-07-2012, 12:09 PM	#349
kris09 Enlisted Member Drives: 2009 328i 6MT Join Date: Feb 2009 Location: miami,fl Posts: 43 iTrader: (3)	Any Updates????