Bought Vision Motorworks 2.5" x-pipe

[King Kong]

Okay, Just received this x-pipe on Friday, it has 2.5" inlet/outlets all the way around, BUT all of the tips are reducers from 2.5" to a 2 1/8" opening leading into the chamber. The chamber itself might be 2.5" (not 100% sure)...My question is, does anyone think this might hinder flow too much? I personally think since I am ridding the stock muffler, resonator, rear cats, and adding POWERSTICKS hi flow chambered mufflers, that the 2 1/8" openings might add some needed back pressure, but just a guess. Everything else is stock otherwise, so 2.5" pipes throughout the exhaust. My ultimate goal is to use this x-pipe just before the powersticks for counter balancing. Any thoughts would be appreciated.

 

[mr. anderson]

I don't think x pipes help the v-10's sound or flow characteristics as the pulses are not scavanged the same as a v-8. not sure about the reduction but the 2.5 to a 2.125 is substantial reduction of air flow, I wouldn't do it myself.

 

[ZCx]

seems like anything below 2.5 would be a restriction. you will still have back pressure from the primary cats.
i would think that anything after the cats needs to be free flowin

 

[King Kong]

Okay well a bit of warning then, The Vision Motorworks x-pipes sold on e-bay are not true 2.5" x-pipes. I am going to order the Bassani's tonight. Thanks!

 

[FATJACK]

The OD of the x pipes should not be a problem. The only thing they are for is to balance the flow of the two sides. Send it to me I will use it.

 

[King Kong]

The OD of the x pipes should not be a problem. The only thing they are for is to balance the flow of the two sides. Send it to me I will use it.

It's the ID that is bothering me. The tips are 2.5", but the inlet into the chambers are all just over 2"...Do you think that might be a problem, or should I just go for it?

 

[FATJACK]

The x pipe is simply for balancing the pressure between the two sets of pipes. I do not see a problem.

 

[King Kong]

cool, well I'll try'em out when the time comes, if for any reason, I do not use'em I'll definitely let it go here at a discount . Thanks again!

 

[ViperPowa]

You really don't want any backpressure, it's a misconception. I would warn against going under a 2.5 aswell, especially if your going to add more power down the road. The flow will be hindered when the pipes get smaller, velocity will slowdown a bit. The X pipe is really to try and add scavenging from the two separate exhaust banks, I would say go for the X pipe, just be carefull with the diameter changes. I would say to try and make the changes in diameter as minimal as possible, that slows down flow the same as unneeded bends. Good luck!

 

[FerrariTruck]

dont worry about it and use it. The fact that you are using a x-pipe now means that the each cylinder can now breathe thru 2 powersticks and not just one, You will be fine if you use it but if you insist try summit racing x-pipe. its a nice piece

 

[King Kong]

Well I think I'll just hold on to this x-pipe for now. The muffler shop I'm going to has their own mandrel bending machine, so if they think the x-pipe will be an issue, I'll just have them fabricate something. Thanks for all your help, at least I didn't spend anymore $$$ unecessarily, I can get a bit anxious when I want something done:cheers:

 

[JTS VENOM PERFORMANCE]

difference between 2 and 2.5 inch pipe..............1.8374 hp........you make the choice

 

[King Kong]

oh thank god! If it had been a 1.9HP loss, then I might have to start over from scratch