HFC midpipe replacements

zsapphire7 · 03-02-2009, 01:24 PM

Is there a vendor that sells HFC midpipe replacements? All ive found so far was 2nd catt delete midpipe replacements. Can any of the vendors point me away

? Thanks!

tinnsoldaten · 03-02-2009, 01:49 PM

Cut the OEM catts off , drill some holes thru catt internals and putt it back on , DIY HFC

zsapphire7 · 03-02-2009, 02:00 PM

Im not looking to gut or delete them. It would be nice to be able to swap to stock for inspection and so on. I want HFCs to balance the effort between emissions and power

. Trying to maximize power without totally killing the enviroment.

tinnsoldaten · 03-02-2009, 02:07 PM

Air traffic and commercial boat traffic does the killing .....

And all industry

not cars....

But if you cut away the rear catts and install a straight pipe there , you got a plenty enough effect I think , cheap also , just need some clamps , pipe and off you go...

ar design · 03-02-2009, 02:09 PM

How many of you guys would be interested in a HFC center section? We might be interested in making one.

zsapphire7 · 03-02-2009, 02:13 PM

I guess ill just say why so much effort instead of listening to ppl telling me to remove the 2nd catts all together. I already have cattless downpipes.

I did a mech lab in college on catalytic converters. Catalytic converters reduce emissions of NOx and incomplete burned hydrocarbons by ~99%. In essense... for every 1 person going full catless ur equiv to about 100 cars worth of pollution (in essense youre driving a whole fleet of cars). I think its fine if u drive very few miles, but i drive/commute quite a bit. Im okay with say throwing out the pollution of 10 cars? maybe even 20. but 100 is rediculous.

Aside from that, its just the smell and smoke i want to avoid. Personal preference. Researching options now. I hope theres a vendor with em. Ive searched some but cant find any. Closest i saw was catback from AE with HFC option. Looking for midpipe solutions...

zsapphire7 · 03-02-2009, 02:15 PM

Quote:

Originally Posted by ar design

How many of you guys would be interested in a HFC center section? We might be interested in making one.

That would be sweet! Are you telling me that nothing exists aside from straight pipes with no cats so far?

Tobias1980 · 03-02-2009, 02:16 PM

Quote:

Originally Posted by ar design

How many of you guys would be interested in a HFC center section? We might be interested in making one.

I might be interested if you can provide data of improvement together with DP's and stock catback (resonators).

BTW looking forward to recieve your catted DP's!

Ville · 03-02-2009, 02:26 PM

Quote:

Originally Posted by ar design

How many of you guys would be interested in a HFC center section? We might be interested in making one.

I would be one of those...

uuni · 03-02-2009, 03:05 PM

Quote:

Originally Posted by ar design

How many of you guys would be interested in a HFC center section? We might be interested in making one.

Depending cost and gains I would be interested.

Mote · 03-02-2009, 03:13 PM

Quote:

Originally Posted by ar design

How many of you guys would be interested in a HFC center section? We might be interested in making one.

Absolutely interested in this, Andrew.

enrita · 03-02-2009, 03:51 PM

Supersprint does center part with HFC but Andrew you know i would jump on your center with cats straight away ;-) .
These are the supersprint ones:

I am going to check out these 2 pieces directly at Supersprint in Italy in April. Will see. Its only 50 km from where i live in Italy, very expensive though.

dkvby · 03-02-2009, 06:24 PM

http://www.milltek.co.uk/exhaust.pro...?variantid=219

TheAcAvenger · 03-02-2009, 07:07 PM

Quote:

Originally Posted by ar design

How many of you guys would be interested in a HFC center section? We might be interested in making one.

I would be in the first batch, and if you could have them ready before my next state inspection in december, that would be great

Former_Boosted_IS · 03-03-2009, 05:34 AM

Andrew, you have a PM

MrZippy · 03-03-2009, 05:46 AM

Quote:

Originally Posted by ar design

How many of you guys would be interested in a HFC center section? We might be interested in making one.

Interested. It would be a nice addition to your catless DP I'll have soon.

Vudoo4u2 · 03-03-2009, 05:56 AM

+1

RynoDyno312 · 03-03-2009, 11:17 AM

Anyone know what these would sound like on an otherwise completely stock exhaust?

I like the way the pipes sound stock for the most part, but a little extra growl and maybe a little more volume would be nice (any power? maybe 5hp?); and I'd rather not ditch the butterfly valve exhuast--I actually like being able to close one side for sound reasons.

Former_Boosted_IS · 03-03-2009, 11:22 AM

Quote:

Originally Posted by RynoDyno312

Anyone know what these would sound like on an otherwise completely stock exhaust?

I like the way the pipes sound stock for the most part, but a little extra growl and maybe a little more volume would be nice (any power? maybe 5hp?); and I'd rather not ditch the butterfly valve exhuast--I actually like being able to close one side for sound reasons.

The butterfly just after the muffler and just before the tip on the exhaust, so this is not even in the same area. The midpipe attaches to the downpipe and would attach before the mufflers.

3er858 · 03-03-2009, 11:29 AM

Any good muffler shop can cut out your secondaries and replace them with HFC's. A good HFC should reduce NoX just as much as the BMW ones do, so you should be fine. I kind of doubt you will notice the difference in performance though... I could be wrong.

RynoDyno312 · 03-03-2009, 11:46 AM

Quote:

Originally Posted by Former_Boosted_IS

The butterfly just after the muffler and just before the tip on the exhaust, so this is not even in the same area. The midpipe attaches to the downpipe and would attach before the mufflers.

I know these don't effect the butterfly valve; that;s why I wanted to know how they would sound/perform with the stock rear section.

Vudoo4u2 · 03-03-2009, 12:53 PM

If I have secondary delete pipes, is it easy to install HFC's on them? to avoid being entirely catless? but still be entirely bolt on?

03-02-2009, 01:24 PM	#1
zsapphire7 Colonel 115 Rep 2,368 Posts Drives: 08 e92 M3 Join Date: Oct 2007 Location: SF Bay Area iTrader: (21)	HFC midpipe replacements Is there a vendor that sells HFC midpipe replacements? All ive found so far was 2nd catt delete midpipe replacements. Can any of the vendors point me away ? Thanks!
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03-02-2009, 01:49 PM	#2
tinnsoldaten Captain 42 Rep 715 Posts Drives: e92 335i coupe Join Date: Dec 2008 Location: Bergen iTrader: (1)	Cut the OEM catts off , drill some holes thru catt internals and putt it back on , DIY HFC
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03-02-2009, 02:00 PM	#3
zsapphire7 Colonel 115 Rep 2,368 Posts Drives: 08 e92 M3 Join Date: Oct 2007 Location: SF Bay Area iTrader: (21)	Im not looking to gut or delete them. It would be nice to be able to swap to stock for inspection and so on. I want HFCs to balance the effort between emissions and power . Trying to maximize power without totally killing the enviroment.
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03-02-2009, 02:07 PM	#4
tinnsoldaten Captain 42 Rep 715 Posts Drives: e92 335i coupe Join Date: Dec 2008 Location: Bergen iTrader: (1)	Air traffic and commercial boat traffic does the killing ..... And all industry not cars.... But if you cut away the rear catts and install a straight pipe there , you got a plenty enough effect I think , cheap also , just need some clamps , pipe and off you go...
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03-02-2009, 02:09 PM	#5
ar design 304 Rep 4,408 Posts Drives: 04 M3 Join Date: Jan 2008 Location: Denver, CO iTrader: (9)	How many of you guys would be interested in a HFC center section? We might be interested in making one. __________________ -Critter
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03-02-2009, 02:13 PM	#6
zsapphire7 Colonel 115 Rep 2,368 Posts Drives: 08 e92 M3 Join Date: Oct 2007 Location: SF Bay Area iTrader: (21)	I guess ill just say why so much effort instead of listening to ppl telling me to remove the 2nd catts all together. I already have cattless downpipes. I did a mech lab in college on catalytic converters. Catalytic converters reduce emissions of NOx and incomplete burned hydrocarbons by ~99%. In essense... for every 1 person going full catless ur equiv to about 100 cars worth of pollution (in essense youre driving a whole fleet of cars). I think its fine if u drive very few miles, but i drive/commute quite a bit. Im okay with say throwing out the pollution of 10 cars? maybe even 20. but 100 is rediculous. Aside from that, its just the smell and smoke i want to avoid. Personal preference. Researching options now. I hope theres a vendor with em. Ive searched some but cant find any. Closest i saw was catback from AE with HFC option. Looking for midpipe solutions...
	Appreciate 0 Quote

03-02-2009, 03:51 PM	#12
enrita Major General 163 Rep 7,377 Posts Drives: 335i - Big turbos Join Date: Sep 2008 Location: Italian in Sweden iTrader: (0)	Supersprint does center part with HFC but Andrew you know i would jump on your center with cats straight away ;-) . These are the supersprint ones: I am going to check out these 2 pieces directly at Supersprint in Italy in April. Will see. Its only 50 km from where i live in Italy, very expensive though. __________________ 07 335i AT - MOTIV 750 - MHD E85 BMS flash - BMS PI - JB4G5 - Okada Coils - NGK 5992 Plugs - Helix IC - Snow Stg. 3 - Stett CP - Custom midpipes with 100 HJS Cats - Bastuck Quad - PSS10 - QUAIFE LSD - BMS OCC - Forge DVs - AR OC - ALCON BBK - M3 Chassi - Dinan CP - Velocity M rear Toe arms - Advan RZ-DF - LUX H8 - Level 10 AT upgrade
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03-02-2009, 06:24 PM	#13
dkvby ☠☠☠☠☠ 21 Rep 684 Posts Drives: 07 Blk e92 335i Join Date: Aug 2007 Location: HK iTrader: (3) Garage List 2007 335i Coupe [0.00]	http://www.milltek.co.uk/exhaust.pro...?variantid=219
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03-03-2009, 05:34 AM	#15
Former_Boosted_IS Major General 330 Rep 5,175 Posts Drives: 4 Wheels Join Date: Aug 2007 Location: Planet Earth! iTrader: (15)	Andrew, you have a PM
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03-03-2009, 05:56 AM	#17
Vudoo4u2 Night Sh1ft 472 Rep 3,079 Posts Drives: F95 X5MC LCI Join Date: Oct 2007 Location: It's bobsled time iTrader: (3) Garage List 2024 BMW X5M Compet ... [0.00]	+1 __________________ "Your first 10,000 photographs are your worst.” ― Henri Cartier-Bresson
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03-03-2009, 11:17 AM	#18
RynoDyno312 Private 0 Rep 86 Posts Drives: 2007 AW 335i Stepronic Join Date: Feb 2009 Location: Santa Barbara/Orange County, CA iTrader: (0)	Anyone know what these would sound like on an otherwise completely stock exhaust? I like the way the pipes sound stock for the most part, but a little extra growl and maybe a little more volume would be nice (any power? maybe 5hp?); and I'd rather not ditch the butterfly valve exhuast--I actually like being able to close one side for sound reasons.
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03-03-2009, 11:29 AM	#20
3er858 First Class Privates 44 Rep 616 Posts Drives: AW F10, CW Mk6, 1299S Join Date: Oct 2005 Location: SCV SoCal iTrader: (0)	Any good muffler shop can cut out your secondaries and replace them with HFC's. A good HFC should reduce NoX just as much as the BMW ones do, so you should be fine. I kind of doubt you will notice the difference in performance though... I could be wrong. __________________ F10 M-Sport \| xdrive LTMW \| Velgen VBM6\| V12's \| CKS coilovers \| wrapped roof \| wrapped mirror caps \| wrapped door handles \| Gloss Black Grills \| M5 rear Lip Last edited by 3er858; 03-03-2009 at 04:11 PM..
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03-03-2009, 12:53 PM	#22
Vudoo4u2 Night Sh1ft 472 Rep 3,079 Posts Drives: F95 X5MC LCI Join Date: Oct 2007 Location: It's bobsled time iTrader: (3) Garage List 2024 BMW X5M Compet ... [0.00]	If I have secondary delete pipes, is it easy to install HFC's on them? to avoid being entirely catless? but still be entirely bolt on? __________________ "Your first 10,000 photographs are your worst.” ― Henri Cartier-Bresson
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