I am getting some HFC's that I know will make the stock exhaust louder, but what I want to know is will a Y-pipe make any difference in how the exhaust sounds?

Also I know 7-10 HP can be found with HFC
what about y-pipe any major power there??? or a waste of money

 

"will y-pipe increase exhaust note" = minimal diff. as for power you won't feel it as much as you would "feel" HFCs. Overall if you are going to completely change out the exhaust system then the overall effect of having a bigger less restrictive y-pipe will be best.

 

it all just works in conjunction with one in another. HFC's may be capable of 7-10hp gains but not without the headers on one end and the full exhaust on the other. To your question though, will you see hp gains from an upgraded Y-Pipe? More than likely not a noticeable difference to brag about. More would be an improvement of sound if anything.

 

A new Y-pipe is OK but you can spend lots of money piecing together a cat-back exhaust. Just get a cat-back exhaust.

 

+1

 

if you purchase an aftermarket y-pipe on an otherwise stock exhaust, about 99.9% of aftermarket y-pipes won't match up to the diameter of the stock exhaust. this would not be optimal for power gain (if any) and the sound change will not be predictable either

 

I want retain the stock rear section. i like the sound. so i should just do hfc's? and no ypipe??

 

like wired said, matching together exhaust components that do not have same or very similar diameters can cause bottleneck issues and undesired "whoosing sounds"

I am unaware of any aftermarket y pipe still in production that is of the same diameter of the stock b pipe.

Also, when doing exhaust mods, start at one end or the other (headers or muffler) not the middle.

My suggestion is headers/HFCs if u want the stock rear section. Changing out the y only makes little sense. Later on you could add a full exhaust if u want.

And what so great about a 100+ lb oem exhaust anyway?

 

 

well i am going to do HFC's and then ask my muffler shop what they can do about the ypipe maybe they can make a custom piece.

 

i agree with davidv, either do a dual cat-back exhaust set up all at once
or start with muffler and work your way forward like i have done, starting
at middle and going in different directions will not improve performance
until you get the whole thing finished.
installed pop-charger noticed more engine growl and whoosh sound and
more throttle response
after i installed muffler noticed louder sound and a little more response
after y-pipe i noticed a deeper tone can't say much on power gain
after plenum spacer with coolant valve-big difference
after hfc-a lot different sound and louder but almost seems like a torque
loss at higher speeds 130mph and up
installing headers and heat wrap next week-curious of what i will feel next

 

Honest waste of money.

 

ok so no ypipe then. Headers are a waste of time and money....so i guess i will just stick with HFC'hps.

how come AAM claims 6-9hp on the ypipe alone, i think there would be some gain.

Thing is, the stock muffler sounds better than 90% of all the aftermarket cats.

 

Is there a particular reason for high-flow catelitic converters? What about test pipes?

 

Berk Technology HFC gained 7 hp and 10 tq with catback and intakes. You don't need headers to gain max hp out of HFC..

 

You may be looking at this the wrong way. You need HFC's/tp's to gain max gains out of headers.

 

1. Headers are not a waste of time/money if you pair them with HFC's/Tp's.

2. If you believe all claims of manufacturers, I have property to sell you on the moon. In regards to the AAM it is a 3 inch diameter pipe--you would be stuffing 2.25 diameter cats into the 3 inch AAM y and then back to a 2.5 inch stock b-pipe. That is not a good thing for airflow or sound. imo, this bottleneck issue would negate close to all claimed gains.

3. Exhaust note sound is purely subjective. You are welcome to your opinion, but many would disagree with you. It's your car, do what you want. The main negative of the stock exhaust imo is the weight.

 

The whole topic was lost. So If I replace my ypipe with a custom one....same diameter will it yeild any exhaust note changes?? No test pipes because A. I dont want smell and B. I hate rasp and a buzzy exhaust note. I initially wanted resonated test pipes but the resonators are too small to reduce any buzzing.

**** headers and 1k for 2-5hp. Thats 1/3 of a FI kit used and thats where I am going.

I would rather spend 500 bucks and gain 20hp than spend 3,000 and gain 38 hp....know what I mean

 

if you get a custom y pipe to the dimension as the oem one then make sure shop is using mandrel bending and not crush bending. otherwise if you keep the oem shape then you have not improved anything as the mandrel bending would flow easier. if are set on a y pipe then why not look at one like tanabe that is as close as aftermarket y pipes get to matching the b pipe. on the front side, the inlet is larger but there should be no issue with the cat size being smaller going into the larger y pipe.

 

Changing your Y pipe to a mandrel bent replacement - will change your exhaust tone. Not too much, but you will notice more rumble and a but more sound. You can also expect a few HP increase - ~2-3.

If you at all are considering going true dual, or possibly a larger diameter after market OEM styled exhaust - don't waste the money as you'll get the replacement anyway.

Rick