Im deciding on either getting a full 3" downpipe with no cat or a 3" downpipe with a high flow cat. Are there really any advantages or what? opinions plz

 

are you looking for the advantages of the HFC?

Removing the cat will make a bit more power, but it is also illegal and more harmful to the atmosphere.

 

go no cat

 

you'll see better gains with a test pipe

i have a 3 inch down pipe and 3 inch test pipe with stock catback and it sounds just like it did with the stock downpipe and cat

and i have a 3 inch QTP electric cutout in my test pipe

 

they say on average you'll gain another 5whp going from HFC to testpipe... give and take a few hp. oh also testpipe will be slight but noticably louder.

 

no cat, not worth the extra cash to pay for a HFC and lose power.

 

For many, smelling the fumes and the marginal gains of a test pipe over a 100 cell cat are not worth it. I have dealt with many people who had a test pipe and couldn't deal with the fumes after awhile and have switched to a 100 cell cat.

Our 100 cell cat flows 75% more than the OEM unit and 50% more than a typical ceramic 3" HFC.



In fact, at just 22.7" of water, our cat jumped to 608 CFM at which point we exceeded the capability of the SF600 flow bench.

 

As of right now.. i got full stock exhaust. I just got the car so i really would like to not have problems with emissions. I want to get 3" dp and 3" exhaust.. but still have the stock cat for emissions and maybe after that switch it out for a test pipe. Whats the best way to go by doing this?

 

Pay for the cat..

It's Legal for one.. so you never have to worry about getting pulled over and checked.

It smells a hell of a lot better... ie I can't stand the smell anymore of a non-catted car. This weekend 2 Evo's pulled up beside me that obviously was running a very loud exhaust. Nice to see them and all, but it hurt my eyes/nose INSIDE the car because I was all of a sudden enveloped in fumes!

So.. that, and if you have friends/relatives that will smell it, it's downright embarrasing when they are disgusted with the smell.

It's also a tiny bit quieter.

Who really cares about 5hp at most? Seriously... Maybe when I was still 21 I thought it made a world of difference.. but I'm a lot older now, and those things just don't count anymore unless you have some strict drag car that you need it all. Heck, even a track car you should spend more money on your driving skills and/or suspension that brute HP.

 

I love the Smell :P, turbo exhaust ftw

 

Let's all kill the enviroment for that extra 5HP.

I don't get it. I use to, but not any more...I guess I'm getting old.

 

Test pipe smells like ***. You don't know until you've had one. I had one a year and a half ago. OMG it was ****ing nasty. Anytime I cop got behind me I would get scared as ****. because if he had his windows slightly down, there was no way he wouldn't smell it.

go with an hfc. A 100 cell is an awesome compromise and thats what I have with no noticeable smell unless you stand a couple inches from the rear and look for the smell.

if your gonna go with a 300 cell make sure its a metal substrate. The ceramic cats don't flow as well and a metal substrate will last you much longer. Good luck

 

It's called evolving. Keep your hp and keep the sky blue and trees green

100 cell cats allow Evo owners to have their cake and eat it too

 

Advantages are:
- No unburned fuel/exhaust smell in the car.
- Less drone of the exhaust
- It is legal

Disadvantages.
- Slighly less power. For many not much of a difference.

I run a WORKS resonated testpipe pipe on my Evo.

 

Go with no cat, your car shoots flames yo!