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      08-06-2009, 03:36 PM   #23
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The HFC's flow better than the OEM primary cats. Not necessary to change, you can get the Fabspeed x-pipe alone and bolt it up to your stock primary cats. I wanted more flow and more sound so I went with the HFC's
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      08-06-2009, 03:38 PM   #24
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Congrats on the setup Tim.

That is correct, we are working on a new HFC option.

p.s. Tim, shoot me a PM so we can discuss the SW tune for your car.
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      08-06-2009, 03:49 PM   #25
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Quote:
Originally Posted by J08M3 View Post
The HFC's flow better than the OEM primary cats. Not necessary to change, you can get the Fabspeed x-pipe alone and bolt it up to your stock primary cats. I wanted more flow and more sound so I went with the HFC's
so would HFCs be louder then keeping the OEM cats?
and if you dont change to HFCs, then you dont get a CEL correct?
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      08-06-2009, 04:02 PM   #26
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Originally Posted by slammedm3 View Post
so would HFCs be louder then keeping the OEM cats?
and if you dont change to HFCs, then you dont get a CEL correct?
Correct. HFC's will be louder than OEM. You will not get a CEL if you leave the primary cats. You also will not get a CEL if you choose the Fabspeed HFC's.
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      08-06-2009, 04:31 PM   #27
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Quote:
Originally Posted by J08M3 View Post
Correct. HFC's will be louder than OEM. You will not get a CEL if you leave the primary cats. You also will not get a CEL if you choose the Fabspeed HFC's.
I've been following this thread and it sounds like Fabspeed is the way to go.
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      08-06-2009, 05:08 PM   #28
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Quote:
Originally Posted by slammedm3 View Post
so would HFCs be louder then keeping the OEM cats?
and if you dont change to HFCs, then you dont get a CEL correct?
The aftermarket HFC's will be louder than the stock units. The Fabspeed setup uses German HJS metallic cats, which do NOT cause a CEL. Going with these 200 cell HFC's should free up around 15whp compared to retaining the stock cats.
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      08-06-2009, 05:09 PM   #29
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Oh and btw I will dyno my car after the Fabspeed HFC's and resonated x-pipe are installed so it may be compared to my baseline dyno.
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      08-06-2009, 05:38 PM   #30
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Quote:
Originally Posted by PunjabiM3 View Post
The aftermarket HFC's will be louder than the stock units. The Fabspeed setup uses German HJS metallic cats, which do NOT cause a CEL. Going with these 200 cell HFC's should free up around 15whp compared to retaining the stock cats.

So how much hp would i be looking at if I just did the xpipe with resonators?
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      08-06-2009, 05:49 PM   #31
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Quote:
Originally Posted by slammedm3 View Post
So how much hp would i be looking at if I just did the xpipe with resonators?
I think a realistic figure would be 5-10whp tops. Most of the power increase comes from replacing the stock primary cats with high flow cats (HFC's) and not from just changing the x-pipe.
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      08-06-2009, 05:51 PM   #32
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You will gain some HP increase by eliminating the secondary cats. They are a restriction, but nothing compared to the restriction of the primaries.
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      08-07-2009, 10:13 AM   #33
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Quote:
Originally Posted by PunjabiM3 View Post
I think a realistic figure would be 5-10whp tops. Most of the power increase comes from replacing the stock primary cats with high flow cats (HFC's) and not from just changing the x-pipe.

Really? thats it you think??

According to their dyno, its closer to 15whp
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      08-07-2009, 10:14 AM   #34
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Quote:
Originally Posted by J08M3 View Post
You will gain some HP increase by eliminating the secondary cats. They are a restriction, but nothing compared to the restriction of the primaries.
Sorry if this is a dumb question, but with this X-Pipe, it eliminates the secondary cats?
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      08-07-2009, 12:42 PM   #35
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Quote:
Originally Posted by slammedm3 View Post
Sorry if this is a dumb question, but with this X-Pipe, it eliminates the secondary cats?
No dumb questions ... just dumb people.
Just kidding of course.

The Fabspeed X-pipe removes the secondary cats and you have the option to have no resonators as well.
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      08-07-2009, 01:05 PM   #36
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Quote:
Originally Posted by slammedm3 View Post
Sorry if this is a dumb question, but with this X-Pipe, it eliminates the secondary cats?
Yes, it eliminates the secondary cats.

It also replaces the crushed up OEM exhaust piping with nice mandrel bent pipe so that it's full diameter the whole way through. Not sure how much HP that part is good for, minor I'm sure. But it can't hurt.
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      08-07-2009, 01:15 PM   #37
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seems like going with the HFC is the best option, but really didnt wanna drop another $2000+

are HFCs worth over $1000? coz thats the price difference it seems between just the xpipe and the xpipe with HFC.
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      08-07-2009, 01:30 PM   #38
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Quote:
Originally Posted by slammedm3 View Post
seems like going with the HFC is the best option, but really didnt wanna drop another $2000+

are HFCs worth over $1000? coz thats the price difference it seems between just the xpipe and the xpipe with HFC.
I don't think that dropping another $1800 on HFC's is a big deal given all the other mods you have on the car. It will help in overcoming the rotational mass of the 20" wheels on there imho.
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      08-07-2009, 01:56 PM   #39
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Quote:
Originally Posted by slammedm3 View Post
seems like going with the HFC is the best option, but really didnt wanna drop another $2000+

are HFCs worth over $1000? coz thats the price difference it seems between just the xpipe and the xpipe with HFC.
It's one of my favorite mods I have done. The sound of the Fabspeed HFC's and x-pipe combined with the AA mufflers is amazing. I don't have any dynos to show HP improvement, but the car feels good.
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      08-07-2009, 02:28 PM   #40
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Quote:
Originally Posted by J08M3 View Post
It's one of my favorite mods I have done. The sound of the Fabspeed HFC's and x-pipe combined with the AA mufflers is amazing. I don't have any dynos to show HP improvement, but the car feels good.
Thats another reason Im worried, I am in love with the sound of my exhaust..I dont think it could even possibly sound any better, I get compliments all day long about how wicked it sounds. I drive by a car wash (but never go there on my way to work every day, multiple times per day) and I finally went there yesterday and the guy wouldnt stop talking about he waits for me in the morning because he is in love with the sound...so many stories just like that. So i wonder how xpipe would alter the sound?
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      08-07-2009, 04:30 PM   #41
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If you find the ER amazing (which it is ! ) , the Fabspeed X pipe and HFC's would make the sound more "blood thirsty" , if you will . I can upload sound clips of my set up in a day or two.
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      08-07-2009, 06:30 PM   #42
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Can the HFC's and x-pipe be installed in a garage without a lift and normal tools? Or do you need to get these professionally insallted? Are they bolt-on?
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      08-07-2009, 06:35 PM   #43
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Quote:
Originally Posted by ecksreturns View Post
If you find the ER amazing (which it is ! ) , the Fabspeed X pipe and HFC's would make the sound more "blood thirsty" , if you will . I can upload sound clips of my set up in a day or two.
I would love that, could you please do that!
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      08-07-2009, 08:08 PM   #44
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Originally Posted by Eliminator View Post
Can the HFC's and x-pipe be installed in a garage without a lift and normal tools? Or do you need to get these professionally insallted? Are they bolt-on?
They are bolt on. I posted a DIY on here. It's not easy while lying on your back, but just cause your movement is limited while being under the car. It can definitely be done, but takes a little time.

http://www.m3post.com/forums/showthread.php?t=271895
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