today i decided to remove my cats and put a straight pipe in the place but before i do anything will this effect anything also how loud will it make it and will i actually loose hp its a 87 302

 

may get a little louder...and you will not lose HP, but actually gain a few from what I hear. I have emmissions, so mine are still on. But I've heard it will give more HP because less restriction.

Someone correct me if I'm wrong...

 

i have emissions but i think you just have to pay a small fine if you dont have any also im asking this because i heard it messes with your ecu and sends wronge messages so it changes how your car runs any one else know

 

Its a federal offense to remove a working catalytic convertor, you know that right? Also, I dont know how your state runs things, but I would fail on the spot without a catalytic convertor. Many shops wont even look at your truck without it. Yes, with the lack of the convertor, your computer can receive improper signals, and change some parameters. That can lead to a decrease in performance. Why do you want to remove them? Its foolish in my opinion. 1.) You are helping to put more crap into the air WE ALL breath...not just your state 2.) the truck will probably run better with a catalytic convertor in place (think high flow cat...) Are you trying to gain more power? Honestly, I get angry when I have to tell people over and over again (I spend a lot of time over in the exhaust forum) about cats. Catalytic convertors and emissions stuff in general, in the very early years, were an afterthought. They did reduce performance and efficiency. This is not the case with the new vehicles. Please dont take offense to my post, but the federal government requires them for a reason, and I would like to help keep the air as clean as I can for my future children. I'll put the soapbox away for now.


Rich

 

I second WheelMA1- I moved to Florida to enjoy the outdoors and would like to help keep air- quality and pass something positive to next generation. I suppose one could argue for driving the hybrid, etc. but fact is the cats are Fed law and even though it burns my toast to see some powerful corporations flaunt the air quality standards I would like to think I do my part.

 

no offense was taken i just decided to take them off because i figured they are getting clogged and catch it before it gets to become a problem i was just goin to take the cheaper way out and get straight pipes to replace them and save that money towards a soft top but since it may send wronge signals if i replace the first cat with a high flow one and for the second cat put a straight pipe will that solve the computer problem

 

It all depends where the oxygen sensor is in relation to the cats. One high flow catalytic convertor will accomplish the same job as the two units on the stock Y pipe. If the sensor is after the high flow cat, there shouldnt be any troubles. If its before, you can have problems.


Rich

 

[QUOTE=wheelMA1]It all depends where the oxygen sensor is in relation to the cats. One high flow catalytic convertor will accomplish the same job as the two units on the stock Y pipe. If the sensor is after the high flow cat, there shouldnt be any troubles. If its before, you can have problems.


can you explain about 1 high flow cat will accomplish the same job as the two stock cats on the stock y pipe

 

The two cats on the stock pipe are not two cats. One is a precat, and the other is the actual cat (from what I understand). I know that I swapped out my stock Y pipe, for a Bassani with one high flow cat, and I passed with flying colors. MA has some of the tightest emissions regulations too.


Rich

 

would it give me better hp gains and less hassle to buy a bassani high flow y pipe since im replacing the whole piping

 

I would imagine it would, but the Bassani stuff is costly. It is stainless steel. Check out proficientperformance.com for some pricing. If you do not want to pay for stainless, I guess you could have an exhaust shop fab you up a new aluminized Y pipe with a high flow cat. If you do a search for bassani in this forum, you can get some names of other people who run bassani stuff (from people who responded in the posts) so you can contact them.


Rich

 

that confuses me, cause my O2 sensor is before the first cat and its stock, so how can that be bad?

 

yea i know all about bassani i actually am running there 3'' catback right now on my bronco but i was going to just get some cheap hp but since im playing it safe and not try to get my computer messed up i think ill save up for the y pipe and hold off on the soft top thanks everyone for the quick replys

 

I take it u have a an 87Bronco, your sensor is before all the cats, so it will not mess with the computer. U should gain a little HP and TQ, as long as u arn't dumping it right out of were the cat was.

As for the Air pollition, big industerial pants put out way more then ours cars. One airliner,in one flight makes at least as much as your car in a year. Plus, what does a cat do? It takes air and mixes it with left over gas and maybe some oil, then burns it, just adding more carbon monoxcide to the air. My smog system on my bronco just took air from a smog pump, and put the air into my exhaust, for what? To burn some left over gas? To hide the fact that maybe my motor isn't running at it's best? I rather have no cats so that I know when my motor may be burnning some oil, or puttin off some excess gas. Cats tend to hide this untill your next smog check. A good clean engine is better then a tired engine burnning oil, but having cats hide that fact. I bet my truck would pass smog, without all the equipment. But I'm not going to spend $100+ to prove a point.

 

yes it is a 87 302 bronco so there aint no lines connecting to the cats if i take them off the lines go into the exhaust before it connects to the cats and i wont have no problems then?