A friend of mine told me an idea he did in one of his old cars he used for drag racing: He opened the cat, removed everything from the inside, and made a custom tube completely free flowing. So basically it was a mipipe under the cover of the original cat. So if a cop tries to do his job, the excuse is 'look, its there, probably malfunctioning, I'll fix it straight away!'
Is this possible?

 

That is how I have my Miata. I ran a 2.75" tube through the hollowed-out CAT body. Looks stock.

 

what do you guys do when its time for emissions since you ruined your stock cat?
shark

 

We just explained that. What part didn't make sense?

 

acting must be one of your virtues. think of shakespeare, thats what I do with the front plate...
am I right, Jeff

 

"I have enough trouble overcoming my own limitations without fretting over the fact that God has not seen fit to distribute evenly the gift of intelligence"
Wanamaker

 

Well, I got the pipe in and holy sh*t is it loud! I will be doing something about this soon. I have the GReddy exhaust and I maybe adding another inline muffler as well. It's just too loud

 

I cant believe its so loud, but more importantly, can u feel a diference in acceleration? How much faster does it feel compared to stock?

 

I can believe it. When I got my SR Motorsports hi-flow cat (w/ resonator) I thought it made my RB exhaust much louder, the midpipe is probably 2X to 3X that. If you have an aftermarket exhaust it amplifies the sound that much more.

 

correct me if i'm wrong, but I thought not having O2 sensor therefore, turning on Cell would have an adverse effect on the performance. The reason being is because the ECU would have to guess the amount of air coming into the engine therefore it no longer supplies the right amount of fuel?

 

I was wondring about this also.I was thinking maybe I should just remove the O2 sensor from the back alltogether..?
shark

 

..sigh..