do the aftermarket ypipes add or cut down on the rasp?

i have stock exhaust except for kenitix hfc. just want the rasp to leave

 

Some opinions here:

http://www.myg37.com/forums/intake-a...-hfc-rasp.html

 

I think an aftermarket y-pipe would create more rasp. But a 350z HR y-pipe might help things flow better.

 

The only things that I've read so far that will to this:

1) Using Motordyne's resonated test pipes (they don't create rasp in the 1st place)
2) Magnaflow resonated X pipe (but you'd have to be able to use a 2in / 2 out configuration. But I don't see why you can use it. Just Y it back into 1 pipe after the Magnaflow

 

im trying real hard to find an HR pipe, link for the magnaflow x?

 

I might have a 370z / G37 Y pipe.

Search threads I've created in this section. Been discussed at length + a picture.

 

the 370 ypipe has smaller inlet diameters

 

You cant add an X-pipe to a stock exhaust. You can only add an X-pipe to a dual flow style exhaust.

 

Wrong. It's not been done yet.

HFCs -> X pipe -> Y -> stock exhaust.

Bolt up? No. Easily done? Yes. Might have to move the stock resonator down a bit but who cares?

Although after that much trouble, I'd probaby merge the X pipe into a larger single. Like a 2.75" or something. Each X pipe in/outlet is 2.25"

Or if your HFCs have 2.5" in/outlets, you can opt for a magnaflow unit sized at 2.5" easily enough.

 

^ Your gonna install an X-pipe between the HFC's and y-pipe? I dont get how thats gonna work. Its def not cost effective. The person will end up making a custom exhaust.

 

No. HFCs -> X pipe -> Y COLLECTOR -> rest of the single exhaust. (but again, I'd use something larger than the stock exhaust (2.5?) if I were going to that much trouble already

 

check this out. This is a modded Y pipe for the back end of a GTR.

They use it ----> then 2 out. But why not use this design in reverse?

HFCs --> Y collector+resonator --> rest of the system

Motordyne's Y pipe has this option but with a cat. Not sure if they offer a resonator in there also.

But a custom one would be EASY to fabricate if you can find a good resonator.

 

whats the midpipe inside diameter?

this is a good idea, but seems like it will all have to be custom after the cats and that might be more work than im looking to do now. plus a bigger exhaust is only benefitial if you are modded more, all i have is a plem spacer. it can actually hurt power if the exhaust is too big for the engine

 

If you ONLY care about cutting rasp, you could cut open your stock 03 Y and weld in a resonator. Looks to be more than enough room to do that.

But in reality, I'd try to usa a better designed Y and put a resonator in that. But that would mean moving your exisiting resonator down some. Not too bad.

Gotta bite the bullet if you want to innovate.

You could try a ginormous 03 sedan suitcase mid pipe and see what happens

 

do you have a vid of the rasp?