HFC's. Stillen or Berk???

Stockgtr · 06-17-2009, 02:29 AM

I thought I'd ask the question.
Which one ones would you buy if you were keeping the rest of the exhaust system stock.

LiquidZ · 06-17-2009, 08:53 AM

Quote:

Originally Posted by Stockgtr

I thought I'd ask the question.
Which one ones would you buy if you were keeping the rest of the exhaust system stock.

Probably the Berks. A lot of people have them and have had great success with them.

NisMoDo · 06-17-2009, 10:31 AM

^^ i agree i'd go with Berk also.

semtex · 06-17-2009, 12:02 PM

Berk, because it has an extended O2 port the Stillen doesn't. Plus you don't need to worry about re-using the stock o-ring on the stock cats.

gnarf · 06-17-2009, 12:07 PM

Quote:

Originally Posted by LiquidZ

Probably the Berks. A lot of people have them and have had great success with them.

FuszNissan · 06-17-2009, 01:11 PM

Berks line up to everything so nice too! I love my berks

Phimosis · 06-17-2009, 03:12 PM

Quote:

Originally Posted by semtex

Berk, because it has an extended O2 port the Stillen doesn't. Plus you don't need to worry about re-using the stock o-ring on the stock cats.

the stock cat doesn't use an extended O2 port. Having a long tube makes me think the O2 sensor would give an inaccurate reading because hardly any fresh exhaust gas is moving by the sensor. What is the logic behind using a long O2 sensor tube?

semtex · 06-17-2009, 03:28 PM

Quote:

Originally Posted by Phimosis

the stock cat doesn't use an extended O2 port. Having a long tube makes me think the O2 sensor would give an inaccurate reading because hardly any fresh exhaust gas is moving by the sensor. What is the logic behind using a long O2 sensor tube?

The same logic as using anti-foulers with test pipes (which close off the O2 sensor from the exhaust entirely, btw). The extended tubes are basically built-in anti-foulers. Also, keep in mind that there are O2 sensors in the headers, and that's where the functional data is being gathered from. The sensors in the cats are just there to make sure the gasses that have passed through the cats aren't 'too dirty', so when you go with test pipes especially (HFCs to a lesser extent), giving those secondary sensors an inaccurate reading is actually a good thing. In other words, you want to 'trick' those sensors into not sensing the dirtier exhaust gasses. Again, not so much a concern with HFCs as with test pipes, because with HFCs, they're still cats. But with test pipes, you're not filtering the exhaust at all, so you definitely want to shield the sensors. I ran test pipes in my 350 and within a couple of days it started throwing CELs. I'd reset it, and it'd just come back. So I finally broke down and installed anti-foulers to segregate the secondary O2 sensors from the exhaust completely.

One other thing I forgot to mention is that the Berks have built in ports for wideband O2 sensors, and the Stillens don't.

FricFrac · 06-17-2009, 05:52 PM

I've got the Stillen HFC and CBE (and G3) and it sounds fantastic - even better than I thought it would. No rasp or install issues and I like having all the same manufacture parts as well. I was worried it wouldn't be throaty enough but it sounds really mean and agressive. Finally my car sounds like it looks and the extra HP doesn't hurt either!

spearfish25 · 06-17-2009, 10:17 PM

Any problem with engine warning lights with either of these HFCs installed?

semtex · 06-18-2009, 09:45 AM

I've had no CELs with the Berks.

BerkTech · 06-18-2009, 05:21 PM

Our HFC's are true 2.5" for maximum flow... We have seen other companies HFC's reduce to 2.25" or smaller

Brazilbro · 06-22-2009, 07:18 PM

Just installed my Berks race pipes yesterday and everything went great!! perrrrrfect fitment and everything.

My CEL came on at the end of my 2hr drive home from the shop that installed them.. which i dont care about as long as it doesnt cause any problems.

Once again

to BERK!

FricFrac · 06-23-2009, 03:25 AM

I was debating test pipes but I ended up going with the Stillen HFC and CBE and now I don't have to worry about the CEL

BerkTech · 06-23-2009, 05:33 PM

Our HFC's include cel fixes so you don't have to worry about a CEL.

Quote:

Originally Posted by FricFrac

I was debating test pipes but I ended up going with the Stillen HFC and CBE and now I don't have to worry about the CEL

06-17-2009, 02:29 AM	#1 (permalink)
Stockgtr Base Member Join Date: Jun 2009 Location: Melbourne Posts: 9 Drives: GTR R33 Landcruiser Rep Power: 16	HFC's. Stillen or Berk??? I thought I'd ask the question. Which one ones would you buy if you were keeping the rest of the exhaust system stock.

06-17-2009, 12:02 PM	#4 (permalink)
semtex A True Z Fanatic Join Date: Jan 2009 Location: Behind enemy lines Age: 54 Posts: 5,995 Drives: People to drink Rep Power: 32	Berk, because it has an extended O2 port the Stillen doesn't. Plus you don't need to worry about re-using the stock o-ring on the stock cats. __________________ "There are no small accidents on this circuit." -- Ayrton Senna 316.8whp & 248 ft/lbs (Dyno Dynamics) \| 319whp & 256 ft/lbs (DynoJet) (04/23/10) Stillen G3 CAI, CBE, Pulley / F.I. LTH / GTSpec Ladder Brace / Setrab Oil Cooler / UpRev-tuned by Forged Perf.

06-17-2009, 01:11 PM	#6 (permalink)
FuszNissan A True Z Fanatic Join Date: May 2009 Location: St. Louis Posts: 14,275 Drives: Pure Sex Rep Power: 542	Berks line up to everything so nice too! I love my berks __________________ Mods: Too Many to list! LouFuszNissan ZDAYZ 2012

06-18-2009, 09:45 AM	#11 (permalink)
semtex A True Z Fanatic Join Date: Jan 2009 Location: Behind enemy lines Age: 54 Posts: 5,995 Drives: People to drink Rep Power: 32	I've had no CELs with the Berks. __________________ "There are no small accidents on this circuit." -- Ayrton Senna 316.8whp & 248 ft/lbs (Dyno Dynamics) \| 319whp & 256 ft/lbs (DynoJet) (04/23/10) Stillen G3 CAI, CBE, Pulley / F.I. LTH / GTSpec Ladder Brace / Setrab Oil Cooler / UpRev-tuned by Forged Perf.

06-18-2009, 05:21 PM	#12 (permalink)
BerkTech The370Z.com Sponsor Join Date: Jan 2009 Location: Irvine CA Posts: 279 Drives: Lots.... Rep Power: 272	Our HFC's are true 2.5" for maximum flow... We have seen other companies HFC's reduce to 2.25" or smaller __________________ While the others type fast... Berk Technology goes fast.... See you at the track! OUR NEW PHONE NUMBER: (714) 546-BERK READ THE BERK BLOG HERE

06-17-2009, 10:31 AM	#3 (permalink)
NisMoDo Base Member Join Date: Apr 2009 Location: de Posts: 34 Drives: no Z for me :( Rep Power: 16	^^ i agree i'd go with Berk also.

06-17-2009, 05:52 PM	#9 (permalink)
FricFrac A True Z Fanatic Join Date: Dec 2008 Location: Victoria, BC Posts: 1,481 Drives: 370Z 300ZX 280ZX 240 Rep Power: 228	I've got the Stillen HFC and CBE (and G3) and it sounds fantastic - even better than I thought it would. No rasp or install issues and I like having all the same manufacture parts as well. I was worried it wouldn't be throaty enough but it sounds really mean and agressive. Finally my car sounds like it looks and the extra HP doesn't hurt either!

06-17-2009, 10:17 PM	#10 (permalink)
spearfish25 A True Z Fanatic Join Date: Mar 2009 Location: Naples, FL Posts: 4,117 Drives: to work Rep Power: 1856	Any problem with engine warning lights with either of these HFCs installed?

06-22-2009, 07:18 PM	#13 (permalink)
Brazilbro A True Z Fanatic Join Date: Mar 2009 Location: Indianapolis, IN Posts: 1,131 Drives: Juke/240Z Rep Power: 848	Just installed my Berks race pipes yesterday and everything went great!! perrrrrfect fitment and everything. My CEL came on at the end of my 2hr drive home from the shop that installed them.. which i dont care about as long as it doesnt cause any problems. Once again to BERK!

06-23-2009, 03:25 AM	#14 (permalink)
FricFrac A True Z Fanatic Join Date: Dec 2008 Location: Victoria, BC Posts: 1,481 Drives: 370Z 300ZX 280ZX 240 Rep Power: 228	I was debating test pipes but I ended up going with the Stillen HFC and CBE and now I don't have to worry about the CEL __________________ '09 370Z - '93 300ZX Vert - '83 280ZX - '83 280ZXT -'81 280ZXT stroker - '72 240Z - Stillen CBE, HFC, G3, Grounding Kit, Sways // Swift Spring // H&R 15mm // 5% Tint // Clear Bra //

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