theproblemkid21

ok well im looking into buying an ATLP race pipe or hi-flow cat... does anyone know which is better.. im also going to have pre-cats so im trying to see which would sound nastier with the ATLP DUAL EXHAUST and J-PIPE V2?????

Hi speed

iTrader: (3)

The race pipe will be louder and the hiflow cat will reduce smell and some raspyness. The hp difference will be very small, it's mostly a sound and smell thing.

lumyeinjun

iTrader: (1)

^and price. The high flow cat (HFC) would cost more, but it'll be better for the streets! cats provide an area where unhealthy chemicals (such as carbon monoxide) can react and transform into less toxic chemicals (Carbon dioxide); that's the reason high flow cats reduce the bad smell that is characteristic of exhaust systems with test pipes. The downside to HFCs is that they cost more and probably weigh slightly more (negligable difference). I would recommend a HFC though, just to be nice to other drivers in the street, the people in your home (if you park in the garage) and to the environment!

c2pid

iTrader: (12)

+1 for FHC. I ran the race pipe with pre-cat deletes for about a week, couldn't stand the smell and the rasp. Even with the HFC, I still could smell a little bit of fuel inside of the car.

Izzy-Type-S

iTrader: (1)

Really? You could smell fuel in the car? Interesting. My ATLP goes on tomorrow but the HFC and Jpipe will be next month. OP you should also check on local laws, the state of Illinois where I'm from has some pretty tough penalties for running with no cat. Some shops wont even install a catless system.

c2pid

iTrader: (12)

I don't smell the fuel while I'm driving. But after I park it in the garage during nighttime, I would smell a little bit of fuel in the morning. Perhaps it was in an enclosed environment. Not a biggie, but worth mentioning.

theproblemkid21

aah ok well im bout to buy my race pipe when i get home from school today and i guess my pre cats on my next paycheck so that'll be funn.... niceee

AckTL05

iTrader: (18)

high flow cat would be 50 states emissions legal, and if your going PCD you will need it. It also helps rasp and smell.

theproblemkid21

so if i get the race pipe ill have to change it to hi-flow cat after i install my pre cats???

erick3

it's personal choice really. i really do recommend getting the hfc. the smell is simply unbearable at times.

AckTL05

iTrader: (18)

I would highly recommend going HFC for third if you are going PCD.

theproblemkid21

so basically the hfc does a better job at covering the smell, and the race pipe doesnt help that much.. well im really looking for something loud when i press on the gas pedal and dont really care for the smell, so is there really a difference other then the prices???

Hi speed

iTrader: (3)

The HFC will also quiet the exhaust alittle and reduce drone. I am running the race pipe, but I have hi flow primary cats. A straight thru exhaust will be raspy and may sound too loud for some people.

theproblemkid21

ahaha well there concerns arent mine but ill probably go race pipe and install pre-cats after my inspectation...

dgarcia520

Izzy,
I'm in IL too. If I go w/ J-pipe & racepipe combo do you think i'll have emissions problems here? No under hood inspections and no Dyno testing here either. What are your thoughts? What HFC ya gonna go with, just curious?

d-townhakuzo

I think you should get the HFC. If pre-cats are one your list, you are going to have a tough time with inspections, and they might check if you have a 3rd cat once you see that. The HFC will help with the inspection and it is overall better. The HP difference is not noticeable at all. Save up and get the HFC...

I hate cars

LOL at the guys saying the smell is unbearable. I wonder how people survived before cats when nearly everything was V8 powered. It's not bad IMO but I'm used to cars with no cats.

The car will pass tailpipe emissions without the 3rd cat but it won't pass visual if the guy bothers to look.

alexSU

iTrader: (3)

If you plan on getting the pre-cat deletes, get a HFC. The rasp is insane with a test pipe! Sounds like trash with the test pipe, not a sexy growl anymore.

The smell on the other hand, I love it!

pohljm

I dont think that is correct. you cannot alter the system at all in CA

dgarcia520

all good stuff, thanks.

theproblemkid21

i live in virginia i have a race pipe will i be ok for emissions mine is due June????

AtlM5

I don't think you have to worry about the states laws other than their emissions procedures. Tampering with the cats is a federal offense. I think their is jail time involved and many thousands of dollars in fines. I really wouldn't worry about it though. It's is very unlikely that you would get caught. But I am in no way advising you to do it.

AtlM5

To the OP: get the HFC...I'm 17 so I know where you are coming from but rasp is ricey and what kind of a dirt would turn a TL into a civic. Loud is good sometimes but I'd want a good quality sound especially since you are paying all that money for a nice ATLP exhaust. It'll smell better and sound better. And it will still be loud.

theproblemkid21

damn i guess i'll just wait and save 200 dollars short for pre-cats and hi-flow cat..... fml

alexSU

iTrader: (3)

i have pre-cats, j-pipe, test pipe, atlp base exhaust...the rasp is very bad!! if you didnt have pre-cats, its ok but im sure you'll want to buy those in the future.

save your money and get the HFL

theproblemkid21

would you mind putting up a video i would like to hear it if possible

geniusnouman

I'm too planning on getting a HFC or test pipe. So what most of the people here are saying is that there is no noticeable difference in hp between HFC or test pipe. So my question is, are there any hp gains from upgrading to HFC from stock in the first place?

7thGenV6

I would get the race pipe. Bear in mind, it is an over-priced hollow pipe, that did not alter the tone. Paying this much cold cash is nutz.

rex1

I must be one of the only ones that actually likes the smells the comes along with being catless

AckTL05

iTrader: (18)

You can get a custom HFC magnaflow for $200 all said and done.

csmeance

In my opinion, get yourself the Pre-Cat Deletes first before the 3rd cat. That way you remove the biggest restriction first and get the most for you money now. That way you can see how it sounds the way it is and see if you want it louder or what. As well you can see what the smell is with a cat in place.

After that I'd suggest you get yourself a J-Pipe to further reduce restriction in the exhaust, and then last a race pipe or HFC depending on how you want it do sound. The difference in power isn't that noticeable, I mean it's going to be 2-3 WHP which is hard to notice.

Inaccurate

^ Great suggestion from csmeance. I agree.

Bearcat94

^^

If you do the pre-cat deletes, just make sure you're not going to get into any smog inspection difficulties. Laws/inspections, etc vary from state-to-state, so just be informed about what the possible consequences are where you live.

Izzy-Type-S

iTrader: (1)

Sorry man, never saw your post I was out of town from the 8th through last week. I'm going with the High Flow Cat from ATLP. I do hear it will lessen the drone & thats what I am looking for. I know Illinois is very tough on emmissions issues & I personally wouldn't risk running without a cat. Two different shops here told me they wouldn't even install the race pipe or any system without some sort of cat. It's not worth it on a daily driver vehicle.