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Z1 HFC Review

Old 10-29-2014, 07:00 PM
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RavensMinded00
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Z1 HFC Review

Hey everyone. I'm mostly a lurker on the website but try to add to the community when I can. I was reading through multiple forums regarding HFC's (high flow catalytic converters) and saw someone mention the Z1 HFC and decided to give them a shot. There isnt alot of information about them so I figured I would do a review for our sedan guys looking for different options.

The price was very reasonable and Z1 seems to have a pretty good reputation with the 370z guys. The quality seems good, the welds look very solid and the kit came with everything needed. Anyways I have a few pictures that I can add now since they were delivered today. I will try to install them this weekend and update with some before and after videos with my stock exhaust.

[IMG][/IMG]

[IMG][/IMG]


So today I had the cat's installed. I was going to do the work myself but after seeing how bad the condition of the existing bolts were I caved and had the professionals handle it. After 4 hours and alot of time behind the torch the Cat's were in and I was on my way. The first start up sounded good with a noticeable extra growl and depth of sound but nothing crazy. Once I was on my way I can only describe the sound with two words. Rasp City. Very disappointed in how much Rasp is present. Im hoping its just a matter of something being loose or the seals need time to expand cause I have no patience for this sound. Can anyone else fill me in if I can expect the Rasp to get better?

Before
http://youtu.be/NY0ylIwG2q0[


After

Last edited by RavensMinded00; 11-01-2014 at 01:46 PM. Reason: Adding information
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Old 10-29-2014, 07:41 PM
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What's the cell-count on the catalyst material?

And are you worried about throwing a code with those shorty O2 connectors?
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Old 10-29-2014, 08:15 PM
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300 CPSI.

If you look in the first picture, they provided extended 02 bungs (on the left).
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Old 10-29-2014, 08:17 PM
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They say on their website that be O2 bungs are OBD2 compliant. Time will tell....

Z1 370Z / G37 High Flow Metallic Catalytic Converters
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Old 10-29-2014, 08:22 PM
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In for the review and to see if they have the love/hate it deceleration hiss.
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Old 10-29-2014, 09:57 PM
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Looking forward to your review as well. I've been on the fence on these for a while. There's another member on here, AMNQ (hope that's his correct username), that also has these on his sedan.
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Old 10-30-2014, 08:53 AM
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I did my review of these also. I LOVE'em, Just had a comment on my exhaust this morning. LOL some guy knocked on my window @ a red light and asked what I was running
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Old 10-30-2014, 11:22 AM
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Do you have the infamous baby rattle/hiss on deceleration ANMVQ?

Last edited by AroundTheG37; 10-30-2014 at 01:57 PM.
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Old 10-30-2014, 01:55 PM
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subb'd would be awesome if someone compared them with FI's
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Old 10-30-2014, 02:02 PM
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ANMVQ
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Originally Posted by AroundTheG37 View Post
Do you have the infamous baby rattle/hiss on deceleration ANMVQ?
Of course . I had it with my FI RHFC's also,
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Old 10-30-2014, 02:03 PM
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Originally Posted by ChinkyChoy View Post
subb'd would be awesome if someone compared them with FI's
IMO better because the cost 100+$ less. I had both I have vids of both up here somewhere too
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Old 10-30-2014, 02:07 PM
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Originally Posted by ANMVQ View Post
IMO better because the cost 100+$ less. I had both I have vids of both up here somewhere too
better? hmmmmmm. The proof will be in the pudding over the longhual, no?
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Old 10-30-2014, 02:11 PM
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Not Sure what the "long" haul would be but putting 100+ back in my pocket sure helped lol
Vid compares on the vids only thing diffeenr is the car the exhausts are the same .

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Old 10-30-2014, 02:41 PM
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one big point that I considered was the price

can I justify the FI HFC being over $100 more than the Z1?
also I don't know if that's a fair comparison since its a coupe vs sedan and resonated vs non resonated.

I personally believe the coupe and sedan sound nothing alike stock for stock and even with aftermarket catbacks
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Old 10-30-2014, 02:44 PM
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The coupe Vs Sedan is a null and void as the exhaust systems are exactly the same, I took my coupe Exoticspeed catback and put it on my sedan,
So the only difference is the the Z1's not being resonated.
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