Anything you do to increase exhaust flow is going to give more sound. But the stock y pipe....well its just ridiculously restrictive. This is due to the nature of the automobile market and aiming to please to common auto buyer. Not a person who is into modding their vehicle like we are haha. Cutting out the y will add power regardless. My next route will probably be hfc's as well. But i have a few appearance mods i want to take care of first. For now, my exhaust sounds smooth and has that definitive VQ rumble that we all love to hear.

 

I know this is an old thread, but I'm curious if any others have had custom H-Pipe or X-Pipes made? If so, did you retain the stock resonators, or did you replace them with other resonators, or did you remove them completely? Any info would be appreciated.

 

i was thinking of getting a magnaflow Xpipe that looks like the one they have on the FI, so i think that is resonated, and then going straight to mufflers. I'm worried about it being way too loud with drone though.

 

hey guys, i got my pipe work done, the master muffler guy looked at it and said y do u want an H-pipe... y not just have straight dual, no connection in the mid.

he works alot on muscle cars and race cars.

so he took out the y and put 2 straight pipes. everything else is stock.

the car sounds a lil deeper and louder...

but i can feel the power, less restrictions for air to flow.

 

Straight dual with no H/X/Y is the worst for performance.

 

+1
A crossover, which is an interconnection between both sides of a dual exhaust system somewhere in front of the mufflers, has been used by automotive manufacturers to reduce sound levels and increase performance. A crossover lets the constantly changing pressure in both pipes equalize by letting each half of a V-type engine simultaneously use both sides of the dual system. In other words, the crossover helps minimize the negative effects of back pressure.

 

Yeah I heard it was much better performance wise and for the engine to have a cross over, unless you managed to get both sides of the piping and back pressure for each side to be 100% equal.

 

Running 2 individual pipes on a V6 would be like having two 3 cylinder exhaust systems. You just eliminated all scavenging potential from you system. Has nothing to do with "backpressure". It has EVERYTHING to do with exhaust gas velocities. Once you look at this way, the benefits of a X/H/Y become clear.

 

learnt from this site everyday. Thanks, guys.

 

this is interesting. the muffler guy was explaining it me: "each side of your V6 has separate headers, so the pressure should be the same."

at the time it made sense, but now that i read what you guys say. this makes sense.

so having that interconnection from each pipe will increase power (from Y to H)? will i lose the deep sound?

im going to go back and have him fix that.

 

In a perfect world, each bank of cylinders would create eaqual pressure, but as well all know, there are lots of variances in automotive manufacturing. I would not run a system without sometime type of crossover pipe in it. You really need this pipe to help balance the back-pressure on each bank of cylinders.

I'm just trying to determine which way to go on my car X or H. I'm more concerned with sound and don't want it to be too loud or drone at all. I'm also considering replacing everthing from my Berk HFC's back to the new Tanabe axle back exhaust I will be getting, so this means replacing the resonators as well... Anyone have any suggestions as to what resonators to use? I'm thinking of either 2-1/4" or 2-3/8" piping.

 

You don't balance back pressure! You time the exhaust pulses from each bank to maximize EXHAUST GAS VELOCITY though scavenging.

 

You are correct, but this happens because you allow the flow to go the path of least resistance...i.e. equalizing the back pressure.

 

No it happens because when you have a properly designed X pipe, the pulses (not flow!) though one side will actually create a small vaccuum in the other side (pulling the other side's exhaust though the cylinder) accelerating the velocity and getting the exhaust out faster. This is why X/H pipes typically help low end torque.

If the only intent was to "equalize backpressure" then in theory, adding a X pipe wouldn't help if the system was already "equalized". But we know this isn't true. Also if eliminating "backpressure" was the way to power, then all one would have to do is install ginormous sized pipe. Which again, we all know doesn't help hp or torque. But is very well explained if you view exhaust in terms of velocity VS backpressure. You have to imagine exhaust as a series of pulses traveling down an exhaust pipe. The faster they run down, the more power you make.

 

Interesting stuff, hey 2g, let me know what route you decide to go, yeah i don't want droning either. Plus are you gonna cur from behind the flex joints all the way to the muffler? or just get rid of the whole middle pit and go from the berks and get new pipes all the way? You understand what i'm saying?