zonblitz

iTrader: (9)

I have a Racing Beat dual tip cat-back, I love it. I love how my car is anything but obnoxious (noise wise). I am about to install a HKS DP on Friday. I am happy with this as it is a huge reliability mod.

My question is this, I have a hi-flow cat that I can't decide whether or not to install. I am worried about 2 main things: Noise and Boost creep (which I do not totally understand btw).

I would be happy to let out more heat as the hi-flo would allow and the hp that comes with I am just stuck trying to decide.

For anyone who has a Hi-flow cat, please tell me what you think of them as well as anyone who happens to have with a Racing Beat dual tip (IMO this is the quietest after market muffler I have ever owned.

All comments welcome.

Thanks

Z

zonblitz

iTrader: (9)

also want to add that emissions is no issue in my state.

thx

rynberg

It will only be a little louder with the hi-flow cat, more so after transition.

The much more open exhaust will result in elevated boost levels, which you can control with a boost controller. Installing a hi-flow cat will NOT result in boost creep, which is uncontrolled rising of boost (and is due to an overwhelmed wastegate).

Go for it.

Kento

I seriously doubt that you will experience any boost creep with a hi-flow cat. However, one thing that I would be worried about is exceeding the capabilities of the stock ECU with that exhaust combination. Do you have a boost gauge? I'd be hesitant to install the hi-flow cat unless you have an upgraded ECU (or standalone) of some sort. EDIT: Or, a boost controller as rynberg recommends.

Noise level will definitely pick up a bit with the hi-flow. I have an RB dual with DP and hi-flow, and it definitely got a bit louder, especially when the secondary comes online at WOT.

FLA94FD

With the stock ECU 3 " down pipe hi-flow cat and racing beat dual my boost would hit 15 psi running way lean and fast as hell. Added a PFC the boost is under control and fuel mix is right but it's way slower and safer, at least for now.

As for noise it will be heard when you open it up and you will loose some low end torque which will be more than made up for up high. At idle its not bad at all, do it.

zonblitz

iTrader: (9)

oh, sorry forgot to mention I have a PFC, just haven't installed. Was waiting till I put the Intercooler in this weekend.

I am ok if noise is mainly different when WOT and 2nd Turbo comes in.

I also was going to put in a "newer" set of turbos in (mine have 92k on them) and the ones I got from another FD guy in New Orleans have about 40k and a ported wastegate.

Guess that would have helped...

My biggest concern was daily put putting around in town, didn't want to sound like a civic with 5" Folgers can exhaust.

My past 2 months has been doing fixes to broken things in the car and reliability mods. Now on to the fun stuff....

Hopefully by Monday I will have installed: My stainless 3" DP, Efini Y-Pipe, newer turbos, Hi-Flo Cat, Greddy SMIC and PFC. I'm assuming I'll see a nice difference in performance.

Here's to hoping everything goes well.

Thanks for your opinions guys.

alberto_mg

wrap the downpipe in header wrap before installing. it will get more heat out of thengine compartment and will quiet the sound just slightly. search for more.

Kento

Just a little suggestion (take it for what it's worth): I'd avoid installing all of your mods at once. Throwing a boatload of aftermarket engine parts onto a car at one time can easily create a boatload of headaches if/when something goes wrong. By installing a ton of stuff at once, you've made your job that much harder when it comes time to diagnose any problems that crop up. Again, just a suggestion.

airborne

Of course when installing a new part means getting your car tuned doing it one at a time can be time consuming and/or expensive. +'s and -'s either way.

Also, I have a dp, hiflo, and rb dual tip and its not annoyingly loud in fact i think its pretty doggone good.

arutha

iTrader: (2)

I agree. Changing the DP/hi-flow at once isn't a big deal since there's only 3 places you could end up having an exhaust leak but you might end up with 12-13 lbs of boost without a controller so the PFC should be installed prior to that to be safe or at least don't get on it until the PFC is installed. Its just good practice to make small changes at a time to see what affect it may have.

And DP, Hi-flow and RB is still pretty quiet. I like mine. Definitely not the obnoxious, droning sound of many setups.

Kento

Agreed, but my point was the fact that (based upon his post) it appears he's going from completely stock to a whole slew of exhaust and intake mods all at once. Installing a set of turbos isn't easy, and there are plenty of things that can go awry during the installation (plus you need to determine that they are indeed working properly). Then installing a PFC at the same time on top of that can add another world of variables that will have to be sorted through in diagnosing any problems.

DaleClark

iTrader: (55)

I think you'll like the sound with downpipe and highflow cat - first off, it's hard for an FD to sound like a Honda with a fart can. FD's just typically sound good with exhaust, period, but it's really about how quiet you want it - it's VERY easy to end up with a deafeningly loud setup. HKS DP/HF cat/RB dual should be good and mellow, but roar at full throttle.

You will VERY likely get boost creep with that setup - I had a spike at transition with just a downpipe and old Trust cat-back. The PFC will control the boost if you don't have a boost controller, but it's pretty basic as a boost controller. If nothing else it will keep things from getting out of control until you get a good boost controller.

I also agree - start with downpipe/cat, get that sorted, go for the next step.

Dale

rynberg

Dale, that is simply not true. I think you are mis-using the term "creep". Since newbies have a hard enough time learning these things, I think it's best not to confuse them!

Like I said above, this setup will result in ELEVATED boost, which is NOT boost creep. I have never heard of a single person who experienced boost creep with a hi-flow cat. Some people don't even experience it with a midpipe, for whatever reason.

zonblitz

iTrader: (9)

ok, just to clear up a few things, my car is not totally stock as of now. I have a apexi power intake, a RB dual tip cat back. Rest are reliability mods, Fluidyne, AST etc. I know that's not too extensive. I was going to install the Intercooler first, and the efini Y-pipe shouldn't make a difference, should it (was going to do when I did DP)?

So are you guys saying wait on the IC and do the Hi flo and DP first? And how long should I wait before installing the PFC then IC or IC then PFC (IC is Greddy SMIC btw)

What about air pump removal? should I wait?

also I am waiting on changing turbos for now. I agree with above could cause more issues if I need to troubleshoot.

rynberg

If you are going to put new turbos in, you might as well do the y-pipe and the downpipe at the same time, unless you like duplicating a lot of work.

You can put the PFC in at any time and I suggest you do it now, to make sure everything's A-OK. The base map is fine for 10 psi without a midpipe as is.

I think you're making the whole situation more complicated than it needs to be. The intercooler and hi-flow cat, for example, are easy to install at any time and won't really effect anything else. The turbos, downpipe, and y-pipe should be done at the same time. The PFC should go in first.

See, not that complicated...

zonblitz

iTrader: (9)

sounds good to me.

Thanks bro.

ROTORhead93

now wasn't that simple