I was lookin into the ZZP Downpipe
wat do u think would b better for more power highfow cat or no cat?
i would figure highflow cat to create back pressure...but maybe im wrong

 

If all you are concerned about is peak power, go cat-less. But having a cat will make your exhaust sound much better as well as make your power curve much better. The reason I say this is because I was with another member when he put his car on the dyno after putting a cat back on. He lost a few peak horsepower, but the midrange was much better.

 

i see so with cat is prolly better cuz u still get power out of it and u keep a nice tone
i have 2.5 exhuast so shoudl i jsut go with the 2.5 dp

 

The 2.5 dp would fit your setup perfectly. And yeah, I don't think you would like the sound of your exhaust without the cat; it would end up sounding very raspy.

 

yea that how my exhaust sounded i had it custom made then when i reved it it was way to raspy..i reliezed my resonator wasnt in so i had them put one in much better nice low rumble

 

I would say if you are highly modded you might want to ditch the cat because i know on my car mine got way way too hot, most of the power coming from going catless is in the tune, because you cna bump up timing, more timing = more power.

 

im not highly modded lol i dont even have stage 2 im trying to find a good deal on it but never can

 

I had to get rid of the CAT to get rid of excessive heat. By getting rid of it I was able to add timing and as a result I gained more power all over.

The big downsides are louder exhaust, raspy exhaust note, and smell. The worst part of this is the rasp.

 

Well if your not highly moded and dont plan to be, or plan to have stage 2 then go with a cat.

 

How strict are your emissions?

 

Hey I see you are in Tempe. I don't think we have met. Do you have the Black RL with the gauge cluster on the pillar?

 

Will be in tempe in a few days.

 

Yah due to high heat problems i got rid of my cat, no cats FTMFW!!

 

As for the heat problem. I do plan on going with a 3" O/R DP when i go with my ZZP header.

 

do u think alc inject would help lower the heat or no or if u get coolin mods....
or does that not have nethin to do with exhuast

 

Exhaust is heat created after the burn. Alcohol does not help there. The idea is to get the HEAT away from the cylinder head as fast as possible.

 

mmm i c thx

 

Catless changes the exhaust tone more than you can imagine. My car with the dump open sounds like a Honda now. But, when I look at my stock dp it is easy to see that it was glowing red hot before.

 

wat gains do u see usualy w/ the dp n wats the best dp 2 get

 

What would be better for a DP 2.5 ZZP or CA and hi flow cats on both . Or just keep stock

 

I wouldnt say anyone d/p is better than the other, anything dp is better than the stock one, you will see higher gains without a cat, due to you being able to bump timing via hp tuners, but you should see a descent gain with a 2.5 d/p with high flow cat.