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Old 10-28-2004, 06:54 PM   #1
mjd85la
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Default track pipe or high flow cat...?

I have a 98 impreza RS with a Borla header and Stromung cat back. i would like to finish my exhaust and get ride of my restrictive cats. I have looked around and cant find the defining statements which one is better.

if I went with a track pipe am i going to have to worry about the o2 sensors just hanging there? am i going to produce any problems in the long run?

if I went went the high flow cat, say stromung or Random Tech, will my o2 sensors just plug in nice and simple with no problemS?

If you have any info or advice it is greatly appreciated. please help point me in the right direction.

thanks

MIKE D
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Old 10-28-2004, 06:59 PM   #2
rabbitnutz
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get a hig flow cat. might i suggest random tech ? i have only heard good things.
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Old 10-28-2004, 09:57 PM   #3
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hey along this idea. what do you guys think of instead of a track pipe (LOUD) a custom resonator to replace the cat

should flow better (i think...) than a high flow cat
quieter than a track pip/cat
cheaper!

has anyone thought of this or done it?
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Old 10-28-2004, 10:11 PM   #4
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It depends on emmissions, I'll probably guy my cat cuz it's kinda clogged (ran leaded gas)..
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Old 10-28-2004, 10:26 PM   #5
rsracer2005
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depends on emmissons. the track pipe will still hold the 02 sensors. there are grooves for them. u will prolly need a mil eliminator with both a high flow cat and a track pipe. depends on emmissions. u will get better gains witha a track pipe. and track pipes are a lot cheaper..
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Old 10-28-2004, 10:37 PM   #6
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so what's the diff between stock hollowed out cats and a track pipe, if ID piping was the same, and bends were basically the same.....is there anything ?
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Old 10-28-2004, 10:40 PM   #7
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ID is larger on any aftermarket exhaust piece than the stock bits. Gutting your stock cat is the least expensive option, but then it leaves you SOL if you'll be required to smog your car.

Get something aftermarket (My vote goes for the high flow cat) and keep the stock cat for inspections and whatnot.
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Old 10-29-2004, 08:29 AM   #8
Texas25RS
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I should have my Random Tech cat next week... so that will be a complete exhaust from the headers back... I can't wait. I will have to post up some clips of the sound of my Top Speed headers, stock cat, Apex I' N1 cat back vs the same with the high flow cat... I just cannot wait...

I did this same debate. I opted for the Random Tech because I didn't feel like swapping the test pipe off at inspection time to pass... if you have not swapped the cat off before, you wouldn't know that it is a bit of a pain without a lift...
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Old 10-29-2004, 01:38 PM   #9
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Quote:
Originally Posted by Texas25RS
I should have my Random Tech cat next week... so that will be a complete exhaust from the headers back... I can't wait. I will have to post up some clips of the sound of my Top Speed headers, stock cat, Apex I' N1 cat back vs the same with the high flow cat... I just cannot wait...

I did this same debate. I opted for the Random Tech because I didn't feel like swapping the test pipe off at inspection time to pass... if you have not swapped the cat off before, you wouldn't know that it is a bit of a pain without a lift...
I still dont know how you get the bolt near the motor off
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Old 10-30-2004, 08:47 PM   #10
Patrick Olsen
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A track pipe will show minimal, if any, gains compared to a good hi-flow cat. Modern metallic substrate hi-flow cats are relatively inexpensive (mine cost $149, plus welding) and will outflow most mufflers and resonators. In my mind there's no reason not to go with a hi-flow cat.

Pat Olsen
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Old 10-30-2004, 11:17 PM   #11
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Quote:
Originally Posted by Texas25RS
I should have my Random Tech cat next week... so that will be a complete exhaust from the headers back... I can't wait. I will have to post up some clips of the sound of my Top Speed headers, stock cat, Apex I' N1 cat back vs the same with the high flow cat... I just cannot wait...

I did this same debate. I opted for the Random Tech because I didn't feel like swapping the test pipe off at inspection time to pass... if you have not swapped the cat off before, you wouldn't know that it is a bit of a pain without a lift...

you'd better, i can't find ANY sounds clips involving N1 exhausts...even though i have one, i still wanna see what combos sound the best...i hollowed out the rear most cat, and after that it sounds nice, but i wann a hear it with a header and highflow cat, or basically anything different than mine.
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Old 10-30-2004, 11:47 PM   #12
Texas25RS
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Quote:
Originally Posted by linux>windows
I still dont know how you get the bolt near the motor off

You have to remove the header from the car....

Step 1: Unbolt the cat back from the cat.
Step 2: Unbolt header from heads.
Step 3: Unbolt single bolt on the cat support.
Step 4: Remove the header/cat assembly from the car and profit!
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Old 10-30-2004, 11:48 PM   #13
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Quote:
Originally Posted by rabitnutz
you'd better, i can't find ANY sounds clips involving N1 exhausts...even though i have one, i still wanna see what combos sound the best...i hollowed out the rear most cat, and after that it sounds nice, but i wann a hear it with a header and highflow cat, or basically anything different than mine.

I love my N1.... almost as much as I did the Borla XR1 I had... but I like loud... of course... inside of my car it is not loud... I have a trunk mat from a Prelude folded in half and put directly over the muffler in the trunk... it is great...
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Old 10-31-2004, 01:12 PM   #14
mjd85la
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A track pipe will show minimal, if any, gains compared to a good hi-flow cat. Modern metallic substrate hi-flow cats are relatively inexpensive (mine cost $149, plus welding) and will outflow most mufflers and resonators. In my mind there's no reason not to go with a hi-flow cat.

Pat Olsen
'97 Legacy 2.5GT sedan


where did you find a CAT that cheap?? a few of my friends work at a muffler shop so welding wont be a problem...

thanks
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Old 10-31-2004, 01:32 PM   #15
Patrick Olsen
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Quote:
Originally Posted by mjd85la
where did you find a CAT that cheap?? a few of my friends work at a muffler shop so welding wont be a problem...

thanks
http://www.rpmoutlet.com/powercat.htm

I have a 2.5" on the Legacy, and I have two 3" on my Mustang. Unfortunately, I bought them for the Mustang a couple years ago when metallic substrate cats were just hitting the market, so they cost like $225 each or something like that.

You can also check Summit Racing www.summitracing.com for converters - they have ones even cheaper from CATCO and Dynomax. They're ceramic substrate, and not as compact, hence they're not as expensive.

Pat
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Old 10-31-2004, 02:57 PM   #16
Jejunum
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no one wants to comment on the idea of welding a resonator in? increased flow, decreased noise!
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