Hey guy's I have done allot of searching and I'm not sure or not if I want to do pcd's when I do the RV6v3 j-pipe. Here is what I want, of coarse I want the most hp as I can get with bolt ons but my main concern is keeping the car sounding tame. I don't mind a little deeper and a little louder but I don't want it LOUD or raspy. I think I'm even going to take my cai off and go back to stock with it because I don't care for the sound. I have type-s quad exhaust, going with the RV6v3 j-pipe which does away with the 3rd cat, probably going back stock on my intake (unless someone convinces me otherwise) and I'm in between on the pcd's or perhaps maybe hi flow precats would be an option. I am very new to the TL's so I'm needing some advice before I buy something that I shouldn't. What do you guys think? Also any other mods I need to check out?

 

if your intake is bothering you i dont suggest you do precats.....just get high flow cats.

 

Hey I was about to get the precats in the BM area because these are a great price, but I was doing searches of the same thing. I think you would be ok and wish I could get them but being in the military I have to worry about emissions on different places I "may" get stationed. Also, I just picked up an RV6 V3 Jpipe and will be doing a Stage 1 or 2 exhaust for sound/performance. Hope this helps!~

 

If you want rasp and a gas smell, get the PCD's
if you want the most HP, get the PCD's.
of course, you can get rid of the rasp by installing a resonator further down on the exhaust.

High flow cats are not yet available. There was a company that made them but HFC started to disintegrate.
RV6 is in the works of making a high flow cat. we're waiting for them!

 

PCDs with stock exhaust will be fine. Very slightly louder, barely noticable. No rasp.

 

Sorry, was at work typing fast and I forgot a couple of questions. What about pcd's with a hi flow 3rd cat? Would that change any performance, sound or help with the gas smell? Also I read that the pcd's cause black to come out the exhaust. If so would a hi flow 3rd cat help with that along with any rasp it might have without effecting performance? Does the pcd's effect mpg?

 

gaw...i LOVE pcds, when i had them anyways. having a high flow third cat will indeed help with the smell (but will still smell bad). as far as sound, just a smidget. the high flow 3rd cat doesn't yield any noticeable hp increase, so i suggest sticking with the oem 3rd cat. the "black" that you're talking about is indeed true - if you clean it regularly, and i mean REGULARLY, you'll be alright - once it's on there, it's a real pain to get off. can't really comment on rasp with the 3rd high flow, but i'd imagine that it wouldn't help much. if you're going stock exhaust + pcds, it'll give more grunt without too much rasp.

here's what it sounds like with comptech exhaust + test pipe + pcds (true exhaust - NO restriction at all)...



revv it in neutral, it'll be darn raspy (hence, i never did it). i'm trying to encourage you to get them here! how can you NOT love that tone?!

 

and mine are just sitting in my garage collecting dust, MAN do i need to get off my ass and install these

 

Eric3... your car sounded sick!

 

If you're worried about the smell, keep the 3rd cat. You don't pick up any appreciable hp anyway.

I don't know why everyone is so sensitive. For many, many years people drove around with no cats. I still drive a car with no cats and on leaded gas and it does not bother me one bit. I don't know what to say about the carbon in the exhaust..... It's exhaust afterall.

 

Just personal preference.
I know I don't want my car to smell of exhaust in the cabin or when I roll down the windows.

If you're after POWER and can forgo the smell, pick up the PCDS.

 

So what's the reason behind a 3rd cat delete and hi flow 3rd cat if they don't help with hp? Sound? If so which sounds better?

 

I believe the deletes tend to be slightly larger in size, so, if you have 2.5-3" tubes going in and coming out of the cat, which is only 2.25", you would have a bottleneck. These values may not be correct, but I believe that is the main reason.

 

a third cat delete will give you 1 or 2 hp. its better then a hi-flow cat and will keep the diameter the same for doing a full exhaust. but if you have a stock exhaust,well thats a different story then. I cant believe your intake bothers you lol keep the intake or else your moving backwards towards your strive for more hp

 

Also something to think about as far as why to delete the 3rd cat: richies new v3 jpipe deletes the third cat to provide longer primaries before they merge. If you wanted to get the best (currently, probably always since no 3rd cat = longer primaries = more power) jpipe, you'd need to get rid of the 3rd cat.

 

I think it completely depends on your emissions testing for the area your in. If you want to change back and forth to comply, or if you have no reason to comply then PCD are good way to go. Here in California I have Pro cats and hopefully I will not have a problem come smog test time. pro cats do last if N/A, only problems were with boosted applications

 

Emissions are strict in my state and with a 3rd cat under the car, with pre cat deletes, I pass no problem at your average shop. I swap the cat in for inspection only.

Now if you took it to honda that is a different story... they know there are "pre cats" and will see those nice shiny pipes when they open the hood.

And as for the smell... i think i'd actually miss it if it was gone, haha.

 

Thanks for all of the info, was very helpful. I think I decided to wait for the hf- pre cats to come out. I'm not gonna race anybody- would love the power though! I just don't want to smell the gas or have the carbon on the back of the car. I did however buy my j pipe yesterday. I wanted the rv6 v3 but I got a rv6 v2 at a good deal. $200 with the hfc. Now with stock type s exhaust will I be losing anything with the hfc vs a race pipe? I may get the v3 later on but It is over twice of what I paid for the v2 and it can't be twice the power. Btw, I know I could do a search but how much hp does the pcd's give anyway?

 

is this really true? any ETA on these from RV6? or was this just an idea thrown out there.

only thing stopping me from getting the deletes was the smell factor, these i assume would eliminate that.

 

Take from this thread:
https://acurazine.com/forums/showthr...high+flow+cats

 

^^^^
thanks justnspace

lets just hope we dont have to wait too long

 

^And honestly will I be losing ANYTHING going back to the stock intake? I would rather hear the exhaust than the sucking noise.

 

Yes, you would. You won't lose 10whp, but you will lose a little power. Plus the combo of I/E sounds awesome.

 

dagoneit!!!!! You guys talked me into it. I just bought the pcd's. So now I got RV6 pcd's, RV6 v2 j pipe and RV6 hfc to put on my car. If I don't like the sound or smell they will be on the black market and I'll go with just the rv6 v3 j pipe with precats and no 3rd cat. so, how much more power do you think my setup will be vs me keeping the stock precats and running just a rv6 v3 with no 3rd cat?

 

^Congrats, you'll love them.
The PCD is the biggest gains, if that answers your question. You will hardly feel just a j-pipe and 3rd cat delete.

 

I love the smell... I have no problem with the smell at all

 

"oh...nizzle my shizzle." LOL
that never gets old, I remember when you first posted that video.

 

honestly, the smell is not bad at all, driving with the windows down its not noticeable. only time its noticeable is if ur parked for a few minutes or in a garage.

also, about the rasp... this is such a hard topic, people think if u have no cats = rasp, wrong actually. its all about the airflow and how smooth it is.

my previous setup was:
rv6 precat -> rv6 v1 jpipe -> rv6 race pipe -> greddy evo2 exhaust

with this setup i had a great deal of rasp from around 2600-3300rpms

my current setup is:
rv6 precat -> atlp v1 jpipe -> rv6 race pipe -> greddy evo 2 exhaust

now i have 0 rasp when there is load on the engine, if i rev the car under no load there is rasp, but really, how often do u rev ur car?

not to bash richie, but, the original rv6 jpipe was a great concept since it was good for lowered cars, but had very poor air flow. that is why there is rasp, because all of the air cant pass through the exhaust properly

so, there is many variables about rasp and who has it.

dont assume.... u make an ass out of u and me .... lol i always wanted to say that

 

How about the rv6 v2 j pipe? Will it flow better than the v1 and be less rasp? and stock type s quad exhaust too.

 

my exhaust system is the most free flowing, every other exhaust has real mufflers, greddy mufflers are more like resonators.

u will not have rasp with any other exhaust setup that include precat deletes since the other exhausts have more restrictive mufflers , u will not get any rasp

therefore the type of jpipe isnt a concern for u in regards to the rasp issue

on a side note, the new rv6 j pipe, the long one(v3 i think), will be the best and provide the most gains

 

I stand corrected, thanks greco

 

I have to disagree here. I had the OBX catback with PCDs and had a decent amount of rasp. You will get rasp with almost any catback if you have the PCDs. I'm surprised you don't Greco with the Evos. My boy has the same setup except with the ATLP V2 and he has a lot of rasp.

However, as long as you put a big enough resonator in, there should be no rasp at all. You can either cut into your catback (not highly recommended), or get an exhaust shop to fab up a midpipe and put the resonator in.

You have a stock Type S exhaust? You shouldn't really get rasp then. If you do, it's just an excuse to get a custom exhaust and throw an 18" or larger resonator in and you should be fine.

 

not too shabby huh? thanks odehboy!

hahaha yeah...good old josh. things sure have changed around here...*nostalgic* haha