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Old 11-17-2005, 03:13 AM   #26
kellie00
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If you track it, TurboXS has a setup that the cat can be switched out for a pipe pretty quick. Other than that I would say stay with one HF Cat. Especially in Cali, tickets scuk.
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Old 11-17-2005, 04:03 AM   #27
McBain_TP
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I like the smell of my catless exhaust, though others might not. I was trying to take a right one time on a busy street, next to a work truck with four guys in it and the windows down. I heard a loud fake-sounding cough, and looked over to see them all glaring at me.
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Old 11-17-2005, 05:22 AM   #28
sixpack subaru
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Hey PPL,
I can't believe no-one has mentioned the other option, the 'electronic controlled divorced dumpipe'!! I have seen them advertised. Basically it's a large diameter 'Y' Pipe that attatched to your existing dump-pipe, it has a stepper motor that can either be switched or staged. So you can drive to the track with your cat, and switch the whole exhaust system off when you get there!! Most of ther ones I've seen have dumped just behind the front wheel. Looks angry, sound even angrier!!

Cheers

Sixpack Subaru
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Old 11-17-2005, 07:35 AM   #29
bren wrx
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TXS is a bull**** ceramic cat, of course its going to break, get a metal substrate like daddys or helix
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Old 11-17-2005, 07:36 AM   #30
sixpack subaru
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Quote:
Originally Posted by bren wrx
TXS is a bull**** ceramic cat, of course its going to break, get a metal substrate like daddys or helix
Now you're talkin
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Old 11-18-2005, 07:21 AM   #31
wrx614
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Quote:
Originally Posted by gooder77

I was running the TXS high flow cat until the brick broke loose and started rattling. Found out that it was a known problem. TXS's high flow cats are made by Magnaflow and they don't cover that stuff unless the cat cracks. The bricks break loose much more often than they crack. I went catless only b/c the high flow would probably fail again eventually.

Ryan
I'm having the same problem with my magnaflow cat (3in high flow). Mine lasted less then a year and has just started to rattle. Gonna get it cut out soon when the new exhaust get put on.
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Old 11-18-2005, 12:13 PM   #32
asno
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Get the COBB DP It has a nice metal substrate HF cat. way in the back towards the donut gasket. Its a little stinky when cold but just fine once warmed up.
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Old 11-18-2005, 12:21 PM   #33
MF-DIF
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Go catless. If someone is tailing you downshift and hit them with the stink. Maybe even shoot a fireball out at the same time.
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Old 11-18-2005, 12:34 PM   #34
dcwrx2
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Quote:
Originally Posted by asno
Get the COBB DP It has a nice metal substrate HF cat. way in the back towards the donut gasket. Its a little stinky when cold but just fine once warmed up.
Speaking of cat efficiency, the 1st cat position (UP) is the best, followed by the 2nd cat position (DP), and finally the 3rd cat position (midpipe). My MadDad DP has the metal substrate cat at 2nd cat position because it is hotter than the 3rd position (cat becomes more efficient), while the metal substrate cat flows so well such that the performance difference between the cat located at DP section or midpipe section is really negligible.
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Old 11-18-2005, 12:42 PM   #35
asno
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Quote:
Originally Posted by dcwrx2
Speaking of cat efficiency, the 1st cat position (UP) is the best, followed by the 2nd cat position (DP), and finally the 3rd cat position (midpipe). My MadDad DP has the metal substrate cat at 2nd cat position because it is hotter than the 3rd position (cat becomes more efficient), while the metal substrate cat flows so well such that the performance difference between the cat located at DP section or midpipe section is really negligible.
Yeah, my cat takes for-ever to warm up. Like 5-10 minutes it seems. COBB seems to think that having it farther away from the turbo helps performance? I'm not so sure about that. I think it was just hard for them to get the cat near their spiffy cast bellmouth.
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Old 11-18-2005, 12:48 PM   #36
Yotsuya
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COBB's catted downpipe is great, but at $575 it's a lot more than the Helix, which I've seen for $399. I still haven't decided if it's worth the extra money.
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Old 11-18-2005, 01:10 PM   #37
asno
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Its not. Get the Helix. Really the only functional difference is that the COBB ends in a OEM style donut flange, whereas the Helix ends in a flat flange. The Helix would probably make a little bit more turbo noise because its bellmouth has thinner walls than COBB's cast piece (but not much). I haven't heard any bad things about either. I would have had to wait 3 months for the Helix when I was shopping for my DP, and I kinda liked the donut gasket, but thats all just personal preference.
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Old 11-18-2005, 01:11 PM   #38
dcwrx2
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Quote:
Originally Posted by asno
Yeah, my cat takes for-ever to warm up. Like 5-10 minutes it seems. COBB seems to think that having it farther away from the turbo helps performance? I'm not so sure about that. I think it was just hard for them to get the cat near their spiffy cast bellmouth.
For metal substrate cat, I think it really doesn't matter where it located (as far as for performance). And if you go for something like 400whp application, you don't want any cats anyway,

One good thing about MadDad's catted DP is because any WG gas will pass thru non-catted, and of course.... cheaper than Cobb's.
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Old 11-21-2005, 08:52 PM   #39
WillysPU
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Quote:
Originally Posted by WillysPU
Anyone have any performance numbers (or guesses) that would show the amount of improvement gained by having a catless dp vs having one with a high flow cat?

Specifically, I have a vf34, uppipe, headers, sti i/c,helix dp catted dp and a borla hush. I am looking for a bit more torque and was wondering how much of a difference I would feel from a catless dp. So basically swapping out the catted helix for a catless helix.

The car is used at the track often.

Any information or comments welcome.
So that was my original post. I picked up a catless helix and swapped out the catted helix.

Results:
Stink - not as bad as I thought. Definately not as bad as my 1956 willys pickup. We will wait to see if the wife and kids notice it.
Sound - very little increase at idle and below 3k at about 4k it wakes up and growls more.
Performance - well I haven't dyno'd it yet, however the butt dyno feels a quicker engine/throttle response and more power at the low end. I will take it to Laguna Seca next week and go for the extended WOT test and then I will probably have a final tune and dyno check done.

Thanks for all the input.

note: installation was uneventful until i whacked the bone right above my eye with the socket wrench handle - (insert hommer simpson sound effect and drip a little blood out)
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Old 11-21-2005, 08:56 PM   #40
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I broke a ratchet the other day and smacked myself in the temple with the broken handle!!LOL DOH!!

(sixpack;kicks back and swaps old war stories with willysPU)
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