Precise1 Posted July 9, 2010 Author Share Posted July 9, 2010 Yep, mine had a pre cat despite nobody believing me No, you misunderstand Bud. We believe you. Both my trucks have it. Initially you said 2 cats not precat and cat, that's what confused me. It's undeniable that they exist (I even sold one) and we know why they are there, we just don't understand the rhyme or reason behind who has them and who doesnt... B Link to comment Share on other sites More sharing options...
GrimGreg Posted July 9, 2010 Share Posted July 9, 2010 Yep, mine had a pre cat despite nobody believing me...its gone now though...pile of junk if you ask me...truck actually runs BETTER without it. Here is a pic.... Don't just toss em out, they fetch a good $$$ at the scrap yards due to the platinum inside them. Link to comment Share on other sites More sharing options...
tmoore4512 Posted July 10, 2010 Share Posted July 10, 2010 No, you misunderstand Bud. We believe you. Both my trucks have it. Initially you said 2 cats not precat and cat, that's what confused me. It's undeniable that they exist (I even sold one) and we know why they are there, we just don't understand the rhyme or reason behind who has them and who doesnt... B I certainly did! My apologies! Link to comment Share on other sites More sharing options...
OldSlowReliable Posted July 10, 2010 Share Posted July 10, 2010 I live in the frozen tundra of Michigan. No pre cat here Link to comment Share on other sites More sharing options...
MadManMike Posted July 14, 2010 Share Posted July 14, 2010 I will have to have it smogged in another month or two, so yes, I will definitely share the grief results... B Well I have been calling around trying to get a quote on doing a new catback on my pathy... Talked to Performance Exhaust in Auburn and they refused to put a High Flow cat on my pathy, he guaranteed me that it would not pass emissions (?). So I sure hope you pass Link to comment Share on other sites More sharing options...
Tungsten Posted July 14, 2010 Share Posted July 14, 2010 That is a bunch of bull@!*% but then again I do have a 91 when the emission standards were more generous. Link to comment Share on other sites More sharing options...
Precise1 Posted July 14, 2010 Author Share Posted July 14, 2010 Well I have been calling around trying to get a quote on doing a new catback on my pathy... Talked to Performance Exhaust in Auburn and they refused to put a High Flow cat on my pathy, he guaranteed me that it would not pass emissions (?). So I sure hope you pass I saved the old cat/precat and would just have to bolt it on if the high flow cat doesn't pass, BUT the Magnaflow unit I got is CARB certified for installation in California so I have to imagine it will pass. B Link to comment Share on other sites More sharing options...
Slashjt Posted July 14, 2010 Share Posted July 14, 2010 Mine also had a pre cat... Now it has only one magnaflow cat runs great (plus headers) Link to comment Share on other sites More sharing options...
Tungsten Posted July 14, 2010 Share Posted July 14, 2010 No one ever needs more than 1 cat. Link to comment Share on other sites More sharing options...
tmoore4512 Posted July 14, 2010 Share Posted July 14, 2010 I want me some headers! My manifolds are cracked and making a racket...geesh. Link to comment Share on other sites More sharing options...
Precise1 Posted July 15, 2010 Author Share Posted July 15, 2010 Doug Thorley, 50 state legal, Nickel-Chrome plated. $400. Highly recommended... B Link to comment Share on other sites More sharing options...
tmoore4512 Posted July 15, 2010 Share Posted July 15, 2010 The quality of the DT over the PS stuff...higher? Link to comment Share on other sites More sharing options...
Precise1 Posted July 15, 2010 Author Share Posted July 15, 2010 The majority of people agree but many people also run the Pace Makers without complaints other than the paint burning off in 7 minutes... B Link to comment Share on other sites More sharing options...
edicer2 Posted July 15, 2010 Share Posted July 15, 2010 i have stock manifolds and down pipes, magnaflow high flow cat, then flowmaster 40 series muffler, and a 4" truck tip Link to comment Share on other sites More sharing options...
Kingman Posted July 15, 2010 Share Posted July 15, 2010 Well I have been calling around trying to get a quote on doing a new catback on my pathy... Talked to Performance Exhaust in Auburn and they refused to put a High Flow cat on my pathy, he guaranteed me that it would not pass emissions (?). So I sure hope you pass Dude. If a TBI injected Pathfinder with 260K on it passed emissions with a Magnaflow high-flow cat, an MPFI should easily pass. Link to comment Share on other sites More sharing options...
MadManMike Posted July 27, 2010 Share Posted July 27, 2010 Dude. If a TBI injected Pathfinder with 260K on it passed emissions with a Magnaflow high-flow cat, an MPFI should easily pass. You would think so. I get my paycheck this week so I am going to get the exhaust put on. I will ask them in person why they won't install it, see if the answer differs. Maybe they are thinking a different type of High Flow cat. -Mike Link to comment Share on other sites More sharing options...
Specv1973 Posted August 9, 2010 Share Posted August 9, 2010 Only one cat came on my pathy and my exhaust is all original and all stock. Link to comment Share on other sites More sharing options...
Tungsten Posted August 25, 2011 Share Posted August 25, 2011 I have been running magnaflow cats for years and never failed a free inspection. Link to comment Share on other sites More sharing options...
lint Posted August 25, 2011 Share Posted August 25, 2011 I have a pre-cat on my '95 SE. I was searching to see if it would be detrimental to remove it & just go with one cat. I think I'll put an intermediate pipe on there instead. Hopefully, I'll have a new exhaust by Monday. Link to comment Share on other sites More sharing options...
Precise1 Posted August 26, 2011 Author Share Posted August 26, 2011 I have removed the pre-cat and gone with Thorley headers and a Magnaflow high flow cat. This system passes California smog so that is not a concern. I had a thread here that asked about the pre-cat but the answers weren't clear IIRC. Basically, they were more prevalent in the later years and the eastern/northern north america. It is for faster cataclysmic action in cold conditions from what I have gathered. There was no true rhyme or reason though... B Link to comment Share on other sites More sharing options...
lint Posted August 26, 2011 Share Posted August 26, 2011 Precise, do you recall the model & price of that Magnaflow? It was a 2" diameter, correct? Link to comment Share on other sites More sharing options...
Slartibartfast Posted August 26, 2011 Share Posted August 26, 2011 Mine had two plugged up cats in it (didn't know why until now though!) and I think it started its life in Idaho. The exhaust guy who repiped it shrugged, cut them out, and put one generic cat in, and the truck felt like it reclaimed a lot of lost power. We don't emissions test around here though, so I'm no help. Link to comment Share on other sites More sharing options...
Precise1 Posted August 27, 2011 Author Share Posted August 27, 2011 I had a thread here that asked about the pre-cat but the answers weren't clear IIRC... And this is it. Damn, I'm losing it!! Precise, do you recall the model & price of that Magnaflow? It was a 2" diameter, correct? No, not exactly, but it shouldn't be hard for me to look up so let me get back to you. Yes, it was a 2" Magnaflow high flow cat, going larger wasn't legal in Ca, 2" was the max and probably sufficient anyway. B Link to comment Share on other sites More sharing options...
nunya Posted August 27, 2011 Share Posted August 27, 2011 I had a thread here that asked about the pre-cat but the answers weren't clear IIRC. B And this is it. Damn, I'm losing it!! B he's showing the signs, lets put him down before it gets worse! Link to comment Share on other sites More sharing options...
sewebster Posted August 27, 2011 Share Posted August 27, 2011 Why would a larger diameter cat cause more emissions? Or is the same amount of catalyst, but less restriction so more flow = less catalyzing effect. Link to comment Share on other sites More sharing options...
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