12-05-2010, 06:53 PM | #2 (permalink) |
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Berk hfs are the more popular and as for gains? They are all pretty close all depending on what center core is used. Fast Intentions are also a good choice. Hp gains are in the 5-7 hp range? Someone could correct me if I'm off.
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12-05-2010, 07:40 PM | #3 (permalink) |
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I have to put in a recommendation for the Berk HFCs: I feel like they have fine tuned the rear o2 bungs to produce the least chance for a check engine light. They also show very good gains, increases the exhaust sound, and are very high quality in terms of fit and finish.
That's my thought on it, but most of the popular choices here such as Fast Intentions and ERZ will be similar in most respects.
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03-23-2011, 02:24 PM | #8 (permalink) |
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I don't feel cats are worth the 4hp gain, never seen a dyno sheet with more gains than that
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03-23-2011, 02:34 PM | #9 (permalink) |
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I have no dyno sheet, but the stock cats are the single largest restriction in the entire exhaust system so I don't understand how that is possible. I installed Berk HFCs in my car with a Tanabe Y pipe and the stock exhaust and put down 309rwhp which is the same or even a bit more power than what other Zs with CBEs put down on the same dyno.
After installing my FI CBE, I felt an additional bump in power and will be going on the same dyno to see what I gained soon.
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-320whp / 259wftlbs- SP Rays -- RE-11s -- SpecialtyZ Tune -- Swift Springs -- Stillen 25R Oil Cooler -- Stillen G3 Intakes -- Berk HFCs -- F.I. 12" CBE -- Stillen Sway Bars -- Es14 Spring -- INGS+1 lip -- CF Spoiler -- GTR Start Button -- VLED Parking Lights -- PWJDM V2 shift knob |
03-23-2011, 04:03 PM | #10 (permalink) | |
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Quote:
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03-23-2011, 05:24 PM | #11 (permalink) | |
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Quote:
High flow cats have a much less dense cell count, as well as a smaller catalyst which is why it is significantly less restrictive than the OEM cats. I think this picture makes the difference quite obvious:
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-320whp / 259wftlbs- SP Rays -- RE-11s -- SpecialtyZ Tune -- Swift Springs -- Stillen 25R Oil Cooler -- Stillen G3 Intakes -- Berk HFCs -- F.I. 12" CBE -- Stillen Sway Bars -- Es14 Spring -- INGS+1 lip -- CF Spoiler -- GTR Start Button -- VLED Parking Lights -- PWJDM V2 shift knob |
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03-23-2011, 06:32 PM | #12 (permalink) |
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Christian thanks for your input, I guess if you can get them for a good price they are useful. I wasn't quite sure how well they performed, I just knew everyone claimed they had them but never really backed them up. Hard to tell how much bigger the stocks really are with that heat shield, but you can definitely tell they are in-fact larger.
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03-23-2011, 08:18 PM | #14 (permalink) |
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Here's a nice review of the Berk's:
http://www.3 7 0 z.com/MagazineArticles/tabid/57/ArticleType/ArticleView/ArticleID/43/Default.aspx (get rid of spaces) Dyno is on page 5. The results seem a bit...ambitious, but nonetheless gains are MUCH more that 3 or 4hp. I think it was test pipes that showed minimal gains over HFC's. I believe FI had a video of their dyno sessions a while back to compare stock, HFC and test pipes.
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