High Flow Cat - Honda Prelude Forum

delguiner · 03-01-2004, 06:42 AM

What advantages does putting in a high flow cat do? do you get a greater sound? minor hp gain? gas mileage?

thanks

[SUB[EX] · 03-01-2004, 07:45 AM

High flow cat makes your exhaust less restrictive. So in return you should gain HP and Fuel mileage. I dont know if the sound is better, with no cat the sound is worse.

i3luemrld · 03-01-2004, 07:55 AM

If u are running a boost set up the less restriction the better. If u are going NA (naturally apsitared) then having too much flow can hurt you, you need to have some back preasure on NA cars.

I have an APex'i N1 cat back i like it, some people dont, anyways i had my Catalytic replaced with an Resonator so i had no restriction at all. Not only did it hurt my power it sounded REALLY BAD! 2 resonators = 2 loud. I sounded like a trumbone blasting down the road. So i switched to a random Tech catalytic hi flow cat, and i imidiatly noticed an improvment over the resonator/cat

so in short dont get a test pipe or a resonator unless you goin to boost.

delguiner · 03-01-2004, 08:02 AM

ok well i dont plan on putting a turbo or NOS in the car for the moment, so i guess getting a high flow cat would be cool right?
maybe make it a little louder and an extra hp or 2

i3luemrld · 03-01-2004, 08:20 AM

yea i would go with a hiflow cat like... Carsound cat or Random Tecchnology... my car sounds deeper woth my random tech, and i am pleased with it as far as performance goes

Oh and the Random tech is about 100$ more then carsound

delguiner · 03-01-2004, 08:28 AM

Ok so you get a nicer deeper sound with your car...

but do you get like HP gain, and performance enhancement?

and is there a website where i can look at the those 2 high flow cats?

Preyluder · 03-01-2004, 04:47 PM

I think I'm gonna buy an 80 dollar Magnaflow hi-flow cat. I don't really see what the big difference is between this and Random tech or Carsound.

jsmooney · 03-02-2004, 11:00 AM

i play trombone....

yeah, i ran the car with open header for a weekend. gas mileage sucked and it had NO power down low.

Sonik_Fury · 03-03-2004, 01:33 PM

I have a resonated straight pipe on my car and a thermal R&D classic. I have a little bit of a raspy note between 3500-4000rpm at WOT, but besides that I still have a nice deep exhaust note. I didn't notice a huge loss down low, and you can feel a little more up top. Whenever I drive by my friends car close to redline he says it sounds just like his friends sportbike, just a little lower tone.