boechler14 Posted October 22, 2004 Report Share Posted October 22, 2004 i was thinkin about gettin my cataylic converter taken out and just puttin in a straight pipe and was just wondering if it has any upsides as well as down sides thanks den Quote Link to comment Share on other sites More sharing options...
slick Posted October 22, 2004 Report Share Posted October 22, 2004 If you have to get your car checked to pass emissions, you will never pass without a cat. Also, just get a high flow cat. You will lose hardly any power and you will still be helping out the environment. Quote Link to comment Share on other sites More sharing options...
jeremy Posted October 22, 2004 Report Share Posted October 22, 2004 I loved the sound of my v6 fiero when I straight piped it, but straight piping my probe made it raspy as hell.... Quote Link to comment Share on other sites More sharing options...
boechler14 Posted October 22, 2004 Author Report Share Posted October 22, 2004 would i lose power if i took out the cat? if so then i dont really wanna be doin that my cars struggling as it is ....in the probe was there any major differences between the fiero ? i have a 3.1 if that will give you a better idea on how mine will sound Quote Link to comment Share on other sites More sharing options...
TeeJay3800 Posted October 22, 2004 Report Share Posted October 22, 2004 Straight piping is fine if your state doesn't have emissions checking. One car without a cat makes no difference to the overall environment. You will notice a difference when you take it off if the cat is clogged. However, on our engines there is virtually no difference between running a straight-pipe or a high-flow cat as far as power. As far as sound, depending on what else you have done to the exhaust, you may want a resonator. The cat acts as a resonator when its installed, so taking it off may make your exhaust a little raspy. I have no cat with a Flowmaster 40. It sounds damn good, but could use a resonator (thats why I'm putting on a Catco). would i lose power if i took out the cat? if so then i dont really wanna be doin that my cars struggling as it is .... You won't loose much of anything. My low-end torque didn't drop off at all. Quote Link to comment Share on other sites More sharing options...
boechler14 Posted October 22, 2004 Author Report Share Posted October 22, 2004 i havent done anything to my exhaust its comepltly original :oops: how much does one of those resonators cost roughly? and as far as emission control stuff i live in canada and im pretty sure they dont worry to much about that kind of thing Quote Link to comment Share on other sites More sharing options...
HokemBokem Posted October 22, 2004 Report Share Posted October 22, 2004 Ive passed emissions to get my plates, do I have to take it again? If so how often is it. Last time I went the failed me bc my service engine light was on. Quote Link to comment Share on other sites More sharing options...
jeremy Posted October 22, 2004 Report Share Posted October 22, 2004 Ive passed emissions to get my plates, do I have to take it again? If so how often is it. Last time I went the failed me bc my service engine light was on. that is state specific, hell in MI we don't even have the tests.....next time if the light is on and you have to get it tested, pull the cluster and yank out the light... Quote Link to comment Share on other sites More sharing options...
cryptnix Posted October 22, 2004 Report Share Posted October 22, 2004 if its something you decide on doing private message me i'll give you the howto for a o2 simulator. Quote Link to comment Share on other sites More sharing options...
TeeJay3800 Posted October 22, 2004 Report Share Posted October 22, 2004 if its something you decide on doing private message me i'll give you the howto for a o2 simulator. That's only necessary on OBDII (1.5 I think too) cars where the O2 is far back in the exhaust. OBDI cars have the O2 sensor in the rear manifold, so having no cat is not a problem. Maybe his is a newer car I dunno.....he has no info in his sig. Quote Link to comment Share on other sites More sharing options...
jeremy Posted October 22, 2004 Report Share Posted October 22, 2004 That's only necessary on OBDII (1.5 I think too) cars where the O2 is far back in the exhaust. OBDI cars have the O2 sensor in the rear manifold, so having no cat is not a problem. Maybe his is a newer car I dunno.....he has no info in his sig. you are correct OB1.5 and OBII both have the sensor there... Quote Link to comment Share on other sites More sharing options...
cryptnix Posted October 22, 2004 Report Share Posted October 22, 2004 well i said that not knowing what year his car was so ... stop harassing me!!! :alcoholic: Quote Link to comment Share on other sites More sharing options...
boechler14 Posted October 22, 2004 Author Report Share Posted October 22, 2004 my cars a 90 3.1 so hopefully thatll help you out with the o2s thing ..im pretty sure tho mine is in the rear manifold Quote Link to comment Share on other sites More sharing options...
TeeJay3800 Posted October 22, 2004 Report Share Posted October 22, 2004 my cars a 90 3.1 so hopefully thatll help you out with the o2s thing ..im pretty sure tho mine is in the rear manifold Yes, it is. There will no draw back to removing the cat other than increased emmisions and maybe some raspiness (but not likely with the stock muffler). Quote Link to comment Share on other sites More sharing options...
DaveFromColorado Posted October 22, 2004 Report Share Posted October 22, 2004 my old sunbird still passed emissions with no catalytic converter (well, a gutted one anyhow) I'm fairly certian the catalytic converter isn't needed on a properly running vehicle - some day I hope to have a 5 gas analyzer to prove this theory. also, I don't have a cat on my 92 Z-34 and it runs like a champ --Dave. Quote Link to comment Share on other sites More sharing options...
boechler14 Posted October 22, 2004 Author Report Share Posted October 22, 2004 how annoying would this raspiness be? would it sound really cheesie or be real annoying or any thing? one main concern is i dont want it to sound stupid or be annoying Quote Link to comment Share on other sites More sharing options...
TeeJay3800 Posted October 22, 2004 Report Share Posted October 22, 2004 I would not worry about it at all with the stock muffler! If you put on a 2-chamber Flowmaster you might want to conisder a resonator. Personally, I think it will sound pretty good with no cat and the stock muff. Quote Link to comment Share on other sites More sharing options...
jeremy Posted October 22, 2004 Report Share Posted October 22, 2004 how annoying would this raspiness be? you could sound like a giant bumblebee....... Quote Link to comment Share on other sites More sharing options...
DaveFromColorado Posted October 22, 2004 Report Share Posted October 22, 2004 I only notice the rasping when the engine is under a heavier then normal load (hard acceleration, or up STEEP hills type thing) --Dave. Quote Link to comment Share on other sites More sharing options...
boechler14 Posted October 23, 2004 Author Report Share Posted October 23, 2004 giant bumble bee thats sounds like the noise i was tryin to avoid..is it at least a mean sounding bee? jk Quote Link to comment Share on other sites More sharing options...
THe_DeTAiL3R Posted October 23, 2004 Report Share Posted October 23, 2004 When you have no muffler that is when it gets loud.. don't worry about the cat effecting the sound too much. Quote Link to comment Share on other sites More sharing options...
TeeJay3800 Posted October 23, 2004 Report Share Posted October 23, 2004 When you have no muffler that is when it gets loud.. don't worry about the cat effecting the sound too much. That's bad advice, C-BAD. My car got 2 to 3 times as loud when I put the straight pipe on. Maybe the difference wouldn't be so great with the stock muffler, but taking the cat off will definitely make the car louder. Quote Link to comment Share on other sites More sharing options...
THe_DeTAiL3R Posted October 23, 2004 Report Share Posted October 23, 2004 When you have no muffler that is when it gets loud.. don't worry about the cat effecting the sound too much. That's bad advice, C-BAD. My car got 2 to 3 times as loud when I put the straight pipe on. Maybe the difference wouldn't be so great with the stock muffler, but taking the cat off will definitely make the car louder. :read: When you have no muffler that is when it gets loud.. Quote Link to comment Share on other sites More sharing options...
TeeJay3800 Posted October 23, 2004 Report Share Posted October 23, 2004 When you have no muffler that is when it gets loud.. don't worry about the cat effecting the sound too much. That's bad advice, C-BAD. My car got 2 to 3 times as loud when I put the straight pipe on. Maybe the difference wouldn't be so great with the stock muffler, but taking the cat off will definitely make the car louder. :read: When you have no muffler that is when it gets loud.. Ummm, yeah. My point is taking the cat off will make the car louder no matter what kind of muffler it has (or no muffler at all). Quote Link to comment Share on other sites More sharing options...
chadz34 Posted October 25, 2004 Report Share Posted October 25, 2004 when you remove your cat you actually gain hp. it's not much but you still should invest in a high flow cat Quote Link to comment Share on other sites More sharing options...
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