none of the sites that sell it list pipe diameter info?

 

pretty sure its 2.5 with 4in tips

 

I thinks it is 70mm, most of the other RX-8 exhaust are. But the SE is only 60mm.

 

borla should be 3in all the way

 

HKS and TurboXS as well. Not that it makes a difference on a NA car.

 

not on NA is right

what do you have 9k?

 

Borla is 3 in up to the muffler, then becomes 2 1/4 in when exiting the muffler

 

I have the TurboXs right now but it's too damn loud. I am getting a resonator welded into the straight section soon.

 

yup its 2.5 but im going to have the piping redone to 3 because its starting to rust really bad at the y pipe. [the guy i bought my SP2 from crashed his 8 and the shop i chose at the time did a shitty job at welding.] might as well do it now, if i ever decide to go FI.

 

yeah each pipe. thus resulting in 4.5 worth of pipe to use

 

got the SP2 on the car yesterday..

Mazsport mid pipe and SP2 make a quite nice combo. I was concerned it would be to loud for daily driving but is nice and civilized until you get on it..they got the sound just right, I am very pleased!

 

Um no. Area of a 3" pipe=> pi*r^2 is pi*(1.5)^2 ~ 7.07in^2, whereas dual 2.25" is going to be 2(pi*(1.125)^2)~7.95in^2. So technically dual 2.25" pipes is equivalent to 7.95=pi(r)^2, divide by pi then square root to get=> r=1.591, times two for diameter which is roughly 3.18".

Done.

 

you still proved my point and you still didnt make my answer wrong. I said 4.5 worth of pipe. I didnt break down how the gas would dispurse inside a split pipe. but thank you mr 9 posts.

 

If you think post count has something to do with intelligence then I don't think you're qualified to speak on the matter. I guess some people just don't have the capacity for intelligence.

The area of a 4.5" pipe is much greater than the area of two 2.25" pipes. Simple as that. It's not the same as just adding the diameter of two pipes together because your are dealing with circles, not squares.

- Mr. 10 Posts

P.S.- If you want to get into surface area, that may be more accurate of a comparison.

 

You beat me to it!

BTW: Mass Flow Rate is determined by flow area, and fluid density and velocity, not by post count.

 

you all crack me up.... I was simply saying that just because the 3 in. pipe gets split into 2 seperate smaller pipes does not mean that you have a negative restriction. JDM, your answer actually proved my point. I added the 9 post comment for a lol, this is the internet after all.

 

No worries, I was on break at work and I tend to think more from and engineering viewpoint when I am there.

 

alrighty mr 11 posts






... hopefully you know I'm just pulling your leg