shane Posted June 16, 2009 Share Posted June 16, 2009 hey guys i have a 90 pathfinder 3.0 with a flowmaster 40 series and the stock cat is holding it back i want to take off the cat at run a straight pipe that is removable so i can put the cat back on for emmisions to the flowmaster, any suggestions? has anyone tried this yet and how did it sound? will i get more horsepower? Should i run a bigger pipe or keep it regular size? or is this just a stupid idea? Link to comment Share on other sites More sharing options...
adamzan Posted June 16, 2009 Share Posted June 16, 2009 I've driven mine with a straight pipe and factory muffler, it wasn't that different. Cops will notice you more as well. Don't do it. Stay legal and get a high flow cat. Link to comment Share on other sites More sharing options...
MY1PATH Posted June 16, 2009 Share Posted June 16, 2009 Magnaflow Direct bolt ons used show up on ebay all the time. I got mine for 70 or 80 bucks, look up the PN on their site as I think it fits other vehicles too. Link to comment Share on other sites More sharing options...
Kingman Posted June 16, 2009 Share Posted June 16, 2009 It does sound different with no cat on there. Done it with plenty of trucks and it always comes out a little louder and throatier. Toyotas, Chevys, Fords, my truck, and a Cherokee. Power? Stock cat to no cat, probably a good amount. Performance cat to no cat? Probably an extremely minimal difference. Usually we just weld up flanges to the end of whatever length pipe (size of the rest of the exhaust) and bolt 'er on. Link to comment Share on other sites More sharing options...
adamzan Posted June 16, 2009 Share Posted June 16, 2009 here is mine with no cat http://s269.photobucket.com/albums/jj74/ad...nt=MVI_0721.flv Link to comment Share on other sites More sharing options...
GrimGreg Posted June 16, 2009 Share Posted June 16, 2009 Yeah, just get a high-flow cat and be done. Link to comment Share on other sites More sharing options...
edicer2 Posted June 16, 2009 Share Posted June 16, 2009 im tring to get a high flow cat i get pulled over for dumb reasons and thats just one less i dont need. I have a 40 series muffler and no cat. it sounds cool but its way to loud cops hate it. Link to comment Share on other sites More sharing options...
adamzan Posted June 16, 2009 Share Posted June 16, 2009 You can get a big fine here if you get caught with no cat. Damn environmentalists. Link to comment Share on other sites More sharing options...
Kingman Posted June 17, 2009 Share Posted June 17, 2009 It's illegal in all 50 states and a fairly large fine... Link to comment Share on other sites More sharing options...
shane Posted June 18, 2009 Author Share Posted June 18, 2009 hmmm well when i get a chance i wanted to redo the entire exhust system with new hig pro headers,high flow cat, delta flow 40 series and split the pipe after the muffler and run two back and all with a 2 1/4 pipe i don't have the money for all that now and i wanted to make my truck sound nicer without spending alot of money cause im going to need a new clutch pretty soon, im thinking about geting a high flow cat now and put it on, then when i redo the whole system i will just keep the high flow cat and add it to the system. what do you guys think? and edicer2, do you have a sound clip of what yours sounds like adamzan, your pathy sounds nice, you said it has no cat with stock muffler or somthing else Link to comment Share on other sites More sharing options...
shane Posted June 18, 2009 Author Share Posted June 18, 2009 hmmm well when i get a chance i wanted to redo the entire exhust system with new hig pro headers,high flow cat, delta flow 40 series and split the pipe after the muffler and run two back and all with a 2 1/4 pipe i don't have the money for all that now and i wanted to make my truck sound nicer without spending alot of money cause im going to need a new clutch pretty soon, im thinking about geting a high flow cat now and put it on, then when i redo the whole system i will just keep the high flow cat and add it to the system. what do you guys think? and edicer2, do you have a sound clip of what yours sounds like adamzan, your pathy sounds nice, you said it has no cat with stock muffler or somthing else Link to comment Share on other sites More sharing options...
beastpath Posted June 18, 2009 Share Posted June 18, 2009 hig pro headers? AFAIK only people who make headers for our trucks are Thorley and Pacesetter Link to comment Share on other sites More sharing options...
adamzan Posted June 18, 2009 Share Posted June 18, 2009 adamzan, your pathy sounds nice, you said it has no cat with stock muffler or somthing else I thought it sounded like absolute sh!t at the time. I have had the whole system replaced with a walker unit. From the front to the back she's all shiny, and most importantly, quiet. Link to comment Share on other sites More sharing options...
GrimGreg Posted June 18, 2009 Share Posted June 18, 2009 hig pro headers? AFAIK only people who make headers for our trucks are Thorley and Pacesetter So are you saying they are low-pro headers that they sell? Link to comment Share on other sites More sharing options...
shane Posted June 19, 2009 Author Share Posted June 19, 2009 hig pro headers? AFAIK only people who make headers for our trucks are Thorley and Pacesetter i was going for pacesetter Link to comment Share on other sites More sharing options...
shane Posted June 19, 2009 Author Share Posted June 19, 2009 So are you saying they are low-pro headers that they sell? lol no im saying anything anything better then ming are high pro, 6 soda cans a coat hanger and a rubber band would put my cracked headers to shame lol Link to comment Share on other sites More sharing options...
Precise1 Posted June 24, 2009 Share Posted June 24, 2009 hey guys i have a 90 pathfinder 3.0 with a flowmaster 40 series and the stock cat is holding it back i want to take off the cat at run a straight pipe that is removable so i can put the cat back on for emmisions to the flowmaster, any suggestions? has anyone tried this yet and how did it sound? will i get more horsepower? Should i run a bigger pipe or keep it regular size? or is this just a stupid idea? Install a high flow CAT with 2.25-2.5" pipe and that's the best of all worlds. Don't be an ass and run without a CAT, they are there for a very important reason. hmmm well when i get a chance i wanted to redo the entire exhust system with new hig pro headers,high flow cat, delta flow 40 series and split the pipe after the muffler and run two back and all with a 2 1/4 pipe i don't have the money for all that now and i wanted to make my truck sound nicer without spending alot of money cause im going to need a new clutch pretty soon, im thinking about geting a high flow cat now and put it on, then when i redo the whole system i will just keep the high flow cat and add it to the system. what do you guys think? and edicer2, do you have a sound clip of what yours sounds like adamzan, your pathy sounds nice, you said it has no cat with stock muffler or somthing else Don't bother with the split exhaust. You won't gain anything real, it will just cost more, be harder to hang and more likely to be damaged on the trail. Yes, set up your exhaust now and just add headers when you can afford to. Please remember, you have a 3 liter V6 (185ish CI); it doesn't need or want a huge sewer pipe exhaust system... B Link to comment Share on other sites More sharing options...
kmgar99 Posted June 25, 2009 Share Posted June 25, 2009 I'm leaving my cat's on my 97 and removing the front muffler(Big one) and rear resonator.The big muffler has quarter size rust holes in it and sounds like crap. I have two Thrush Turbo mufflers left over from my Chevelle so i'm welding up a Y pipe to bring the two 1-3/8" stock pipes that feed the stock muffler into the 2-1/2" Turbo muffler. I'm going to try and exit the tail pipe just in front of the passenger rear tire. Definitely leave the cat or get the high flow one....As stated before putting any bigger diameter exhaust pipe won't gain you much, and i think could actually lower your low end power (which is what we need for off road) I'm hoping my idea will keep the HP and torque the same on the low end. Here's a good write up on building your own exhaust Exhaust Design Link to comment Share on other sites More sharing options...
shane Posted June 26, 2009 Author Share Posted June 26, 2009 ok thank you guys and what size pipe do you think would be the best ? Link to comment Share on other sites More sharing options...
shane Posted June 26, 2009 Author Share Posted June 26, 2009 and also i know this is a bit off topic but i dont want to start a new topic for this question. what psi should i put in my BF goodrich km2s they are 31-10.5 I ushally have them at 35 and drop them to 25 on the trail but i have a small toe due to my torchen bar being cranked up i was concidering bringing to 28 psi for the road and trails. What do you guys think would be a good psi? Link to comment Share on other sites More sharing options...
adamzan Posted June 26, 2009 Share Posted June 26, 2009 I run my 31's at 30. When I went on the trail I dropped them to 20. Link to comment Share on other sites More sharing options...
shane Posted June 26, 2009 Author Share Posted June 26, 2009 i see how are tires better with a lower tire pressure Link to comment Share on other sites More sharing options...
Kingman Posted June 26, 2009 Share Posted June 26, 2009 Allows the tires to conform to things better, and has more surface area in contact with the ground. Link to comment Share on other sites More sharing options...
shane Posted June 26, 2009 Author Share Posted June 26, 2009 whats a good kind of a high flow cat for my 90 pathfinder i want to get one but i have no idea what to get Link to comment Share on other sites More sharing options...
SC88Pathy Posted June 26, 2009 Share Posted June 26, 2009 whats a good kind of a high flow cat for my 90 pathfinder i want to get one but i have no idea what to get Magnaflow http://summitracing.com/parts/MPE-53004/ http://summitracing.com/parts/MPE-22760/ As for tire pressures I run my AT's at 35 on road and 15 or lower on the trails. As Kingman said the lower pressure allows them to conform better and you get a bigger contact patch with the ground. In the real world this means: less likely to pop a tire on rocks, and better traction. Link to comment Share on other sites More sharing options...
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