okay so i told him today im going to gut the cats on my car. he said that would be a bad idea because by doing so i would create more heat on the engine because there wouldnt be enough pressure to push the exhaust gases all the way out. he says my pipes are to small for it to work and my engine light will probably be on all the time. hes been a serious car builder for the last 30 plus years so hes not stupid about anything. BUT THIS IS A ROTARY NOT A PISTON i told him. he says rotaries are excellent exhaust pushers because of the design. duh!

so it might work but in the end it could cause more harm then good.hes says dont do it.
is he full of **** on this or what. has any of you hurt your 13b doing this?

 

Lol, no it will not do any harm! But why not just save up for a full exhaust system? Only harm it'll do is your car won't pass any emmisions testing.

 

NA or TII?

NA you'd be better off leaving them unless your moderately modded.

TII then your dad's turbo illiterate. But still wouldn't suggest it unless you do a full exhaust...even a ghetto exhaust.

 

guting the cats will make the engine cooler. the cats hold the heat in.

but it's really not worth it. exhausts are pretty cheap. the cat's are not. save them incase you need them later. or sell them.

 

yeah...you can even make your own mid-pipe for $20...hell I'm sure someone on here has one lying around.

 

It's removing resitrction, thus going to flow freely, how could it possible create a restriction after gutting it because the pipes too small? That doesn't make sense because the cat would still have to fight that small *** pipe anyway, gutted or not. It's not going to retain heat anymore, as there's nothing inside of it to do so, just going to get noisy and fail emissions and smell

 

thats what i thought. hes a moron. but he does have some serious cars. He never understood my import thing. but hes family so im stuck. ok im going to just get a highflow cat and a cat back. the cats are clogged anyway. thanks for the input.

hey anyone wanna sell an exhaust?

 

living in california, I wouldnt touch anything on my engine

 

yeah but its ok when you know someone who does testing for ummm.. cars that wouldnt pass emmisions.
but youre right.

 

oh
well then, have at it

 

If your cars are clogged, it would be wise to gut them out until you get a new exhaust setup...Clogged cats...Very bad...Good luck/skill!

 

Ok.. alot of bad info above.. or only parially correct..


This is not a piston engine. it doesn't need backpressure. Gutting the cats will raise your power output a bit Also the noise level. It will no longer pass emmisions either. You will also loose a little low end torque.

Now, a full exhaust is gonna gain more and sound a little better. but if there is no cats it still isnt gonna pass emissions.


I see you are in CA, so emissions could be a problem

 

yeah, how are you going to get around the inspection???

Despite my opinion that it is lame to remove the cats because you stink up the air... If you must, and think that you are going to real HP (which you won't) Don't gut the cats, replace them with mid and down pipes so you can bolt them back on for inspection.

 

He's not a moron, he just doesn't have experience with this particular car. Your dad is correct that if you make the exhaust too free-flowing, it will not have enough inertia to flow efficiently, which will reduce the engine's output. However, just gutting the cats or installing high-flow cats isn't going to hurt the performance on the 2Gen RX-7.

 

midpipe/downpipe time...any 2nd gen TII or NA gets a large benefit in the power dept (relative to the power they make w/ the stock stuff). don't gut them, buy bolt on stuff or make them yourself.

 

he already explained the deal with emissions...hes got the hookup for smog...

 

yeah i should leave them alone. icemark is right. ill just buy the parts and keep the cats INCASE something needs to be looked at later.(sometimes the highway patrol makes you go to one of their guys for inspection)
besides , have you seen how friggen expensive they are?

 

If I were you I wouldnt gut my cat if I had a vert. Just get a high flow cat, most modern high flow cats flow just as good as gutted cats and they keep you from stinking up the air you breathe.

 

quick question? how much hp can you get from a vert. full interior. and no.........V-8 swaps dont count.

 

umm the same as a non vert...

 

I think he just doesn't want your car to be noisy.

 

california is supposed to have some stricter standards for smog check, it's called smog II or something like that and it puts your car on a dyno etc.

i think only a few smog stations in the state will be licensed to perform smog II tests and these people are not supposed to be bribable

 

heh, well if that's the case then the only people manning the things will be the cops...and they probably won't know what they're looking for anyway

 

california is stricter on its laws and emission levels. the inspection in a few counties in texas require cars before like 95 to be put on a dyno for emissions testing. i passed with flying colors with a high flow cat on my 87 gxl and a road race header. the header will help you the most because it will allow the air to flow better and will keep your motor cooler. so i say get a catback, high flow cat, and a header. it will have a nice tone and still be street legal.

 

heh you kiddin. if it was cops they prolly would be bribable, just not cheap