RonCT

Exactly. I had one version from the factory and the mufflers I got to modify were the other. AAOC here in Canton just said I need the "donuts" separately. Off came 1 version, on went the other with the donuts from Porsche and done. They told me not to worry which version were the donors and they were right.

Thanks to former poster that created the 2nd and 3rd image.

NYC993

Not that one. I'm talking about the one between exchangers and the cat. You are showing between mufflers and tips

NYC993

see post # 2 here

https://rennlist.com/forums/993-foru...993-911-a.html

RonCT

Gotcha - I left my cats alone, so non-issue for me. Sorry for the diversion.

Magdaddy

LPMM=Leland Pate Muffler Mod

Love my Stage lll's, but...better run the numbers. No emission check here in NY, so do I really need sport cats at all?

911LeeN

sniff sniff, I smell x-pipe cat bypass!

Spyder_Man

This visual aid might be helpful too for explaining where the difference between Bischoff and Gillet really matter:

P-daddy

Yes for Cat to exchangers. Thanks NYC.

Ok I'm in for X pipe, sport cat with bypass

Martin S.

[QUOTE=Martin S.;12923784] Straight from Fabspeed:
5 sets of X pipe and cat bypass, or 200 cell cats: 20% Discount**
10 sets of X pipe and cat bypass, or 200 cell cats: 25% Discount**

The program ends on the 31st of January, 2016
** Fabspeed Maxflows can be included in you selection.

So here is what I need, if you want to be in on the group buy, in order to keep the process somewhat manageable, I need you to e-mail me: mfschacht@gmail.com
Here is what I need from you:
Name: E Mail Address What 993 Fabspeed Product You Want

Note: If you are buying the X Pipe and Cat Delete/Bypass Pipes, you need to specify Gillet or Bishoff. The Bishoff's were found on the 1995 and early 1996. If you look through this string, you'll see the difference. Also note, if you want an additional clue, the OEM Mfg. name is generally front on the bottom of your muffler....but the best thing is to do a little peek with a flashlight. The Bishoff and Gillet exhaust flange are different.

You can run Bishoff mufflers on a Gillet car...but it involves some brass donut flanges...a pain in the ***.

If you have any preliminary questions as to what you have or what you want,
e-mail me at mfschacht@gmail.com If you want me to call you back, PM me or email me.

I certainly hope we can get the ten (10) buyers committed. Looks like we are getting there...how sweet to get a 25% discount. And if we only get five(5), 20% ain't all that shabby either.

In closing, the X pipe and Cat bypass pipe onto Maxflow mufflers is a very sweet sound...not too loud, and at the same time-out too brassy. Let's do this thang!

DiegoR

So tempting! Is the X pipe CAT builded with a 02 sensor bung in the "X" like the factory 95' exhaust? I really don't need the CAT type here, but I'm sick of smelling highr content of emissions of my other cars which are catless from factory.

EDIT: I saw at their website the X pipe CAT BYPASS offer less HP gains over the X pipe with CAT ?? There's something I'm missing?

sand_man

I ran my X-pipe briefly with the cat bypass pipes and Maxflows. It was only slightly more loud, but the smell was obnoxious! Not sure about the HP changes. It does seem to run smoother with the sport cats, so I put them back on.

sand_man

Like I mentioned in another thread, the Maxflows are not aggressive enough for me. They sound good, but much more on the stock side ("sweet sounding", as another user put it). I think Fister IIs will be perfect for me, paired with X-pipe and sport cats. YMMV.

DiegoR

Thanks! Exactly what I wanted to hear. I'm sick of the emission smell, specially in my euro e30 M3 that I can't figure out from where the heck get in the cabbin. But in overall, when I park my car in a closed parking building or the like (M3 & M5 factory catless) I hate the smell of the emissions and I walk away as soon as I can from the car and the surounding areas. That doesn't happen with my 993's or just a random vehicle equipped with CATs system.

So you didn't feel any noticeable overall power gain/loss between the CAT bypass and CATs installed? If so, I'm set on the X pipe with CAT.

Martin S.

Back in the day, I decided to run in a weight to HP class. I had just had the car dynod with stock 993 Factory Cat and sport mufflers, RSRs? Motors sound? I just can't recall, but they were not stock. On a Dynojet dyno run at a reputable shop, the car put out 239 HP. This was not a surprising number. Most folks agree that HP loss through the power train and actually putting the HP to the ground is about 15% of factory advertised HP. So the car was advertised with 282, had about 80,000 miles on it, a decent leak down, so I wasn't surprised when I got 282 less 15%, or 239 HP.

I ran the car this way for about a year, and got the itch for more HP. I was looking for about 10 to 15 HP, so I looked around and discovered Fabspeed's X Pipe and 200 cell cats...up on the dyno again, and the car pulled about 255 as I recall, and it passed CA emissions testing, When I ordered the X pipe and 200 cell cats, they came with the Cat delete pipes....so why not, put them on the car, and the 200 cell cats on the shelf. Back to the dyno, the dyno sheet that is enclosed on this post. Damn! The car pulled 266 HP...the bad news, I was going to have to add weigh to the car to stay in class. For once in my Porsche life, I had too much HP, the dyno must have been wrong. So off to another dyno, and now the car pulls 268 HP, which equals a little more weight for the car...I took that dyno sheet to the shredder and had to live with the 266 HP. I only need to add about 100 lbs, not so bad.

At the track I run in a group that includes Spec Boxsters. With their lower weight, they can be be formidable competitors...however my 993 with 266 HP and lots of torque could always pull them in a passing zone. I surmised it was my great driving skill...it wasn't, it was the added HP. Also note I have run with Spec Boxsters at 239 HP. At this HP, I have to really duke it out with them to get by them, if I could get by. My best hope was to out-quallify them, and then they'd have to get around me.

What's the message here...more HP and torque is always better, and when you can get it cheap, even better. Where else can you get 26 HP for the price of a set of cat delete, or 200 cell cats and an X pipe? Nowhere...it's is tough to get more HP and torque out of a stock 993 motor, especially a 97 that doesn't do too well adding a chip. Sure you can add a 3.8 upgrade, for what, $15,000?

So if you want to be on this group buy, please contact John at Fabspeed and make the commitment. I want to place my order ASAP...I am going to do it with or without a group buy. So let's make this happen. I need the savings to put toward some new rubber.

John@Fabspeed

Great data and review Martin, thank you for the insight!

Just to clarify, I will personally be handling this group buy order. For those that are interested in being a part of this group buy, please PM me with your full contact information and the product you are interested in. I will then add you to the list and post the latest count up on this thread.

As of RIGHT NOW I only have Martin confirmed. PM me guys, lets make this happen for you