hey yall

i was looking into buying a high flow cat convertermaybe the
catco univeral high flow converter. i hoped someone had one on their
car and could tell me if it increase Horsepower any and how much. also does this increase exhaust noise?

and does any have a place that sells them cheap?

 

if you had searched u prob would have got more info.....anyways since i'm talkin might as well give it to you....
get a new y-pipe AND a hi-flow cat concerter from www.warpspeedperformance.com definitely worth it, i feel they have the best deal, and thats the biggest boost in hp for a stock car besides shots and weed.

 

You mean if I let my car slam a few shots of JD, then hold a doobie up to my intake and let my car get high, it'll drive faster!? COOL!

 

u didn't know that? sheesh.

 

get the warpspeed stuff, you'll like it.

 

I had a stock cat, then I gutted it..ran much quicker and pulled harder to redline. Then I put the Carsound Cat from WSP on, and noticed no decrease in performance. I'm sure it added some restriction, but it is efficient and your butt dyno won't be able to tell a difference unless you have a heavily modded engine

 

Save some money and get a straight pipe to replace your cat. 1/2 the price. . . i would say a better increase in power and NO noise increase!! www.testpipe.com. . . . i think there 40 shipped for the 3rd gens. . if your car isnt up there call them and they will make one custom for the same price

 

Just don't try and pass an emissions inspection. Here in Jersey, you gotta do it. Best bet is to get the testpipe and keep the stock cat. Put the cat on for emissions and remove it afterward. Use stainless hardware and keep some extra gastkets around.

 

Stock CAT vs. High Flow

I dont think that a high flow CAT gains any HP per se. I think its just that the stock CAT could be clogged, and by putting a new one on, whether high flow or not, you will notice a power increase because you are used to the loss of performance caused by the stock one.

SCC did a test on a high flow cat on a MR2 (I think), and it LOST a couple HP when compared to the old "crappy" CAT. It was a Random Technology CAT if I remember correctly. Hmmmm?

The suggestion to get a straight pipe in place of the CAT for $40 is the best one I have heard. Too bad its a Federal Offense to tamper with your CAT. Unless of course you are using this only on the track. And dont forget that backpressure is your friend on a daily driver. Be sure to retain some of that backpressure, or say bye bye to low end torque!

Show me dyno numbers comparing a new Nissan CAT vs. a high flow CAT and I will be a believer.

 

 

does the piping inlet and outlet size make a difference?

 

Assuming you are speaking of the CAT or Straight Pipe option...

Yes, but not much. However, if you go extreme one way or the other (too small or too big) you WILL hurt your HP/TQ numbers.

Your best bet is to match your inlet/outlet sizes to existing exhaust set-up. Ex: Y-Pipe = Cat inlet, Cat outlet = B-Pipe inlet.

I hope that makes sense.

 

I did a 2.25inch straight pipe. . . i noticed the difference