If so, I was hoping you could answer a question for me....the long 2" pipes that go to the pre-silencer: do they bolt onto the pre-silencer, or is it permanently connected (welded?)?

I wonder because I was thinking of pulling that off and replacing it with an x-pipe.

 

http://www.racingbeat.com/FRmazda2.htm


check rb website i think all there exhausts are all bolt up systems.. on a side note rb doesnt just slap together parts i think if a x pipe woulda done better i think they woulda made it with one or at least offer one

i just lookd at there ssite and the two pipes that go into the presilencer are welded to it and those two tubes bolt to the header on the other end

 

right, i was just looking only on the pre-silencer part itself, and i couldn't tell if it looked welded, so thanks for eyeing it for me.

i understand that they don't just slap together parts, but i think that an x-pipe is such a low demand part for the rx7, they don't feel it's worth producing.

plus, most x- and h-pipes are actually pretty large (would usually go where the y-pipe comes off, i think), and i'd be trying to make one that's pretty narrow and short

 

So I take it you're buying the road race header? Considering otherwise making an x-pipe or a y-pipe wouldn't really work.

Think about the x-pipe (or h-pipe) idea with a collected header and you'll realize it really doesn't work. That's why it's not worth producing.

 

Yes, I plan on getting the road race header. Obviously the collected header wouldn't do anything, but I guess that makes it obvious why it's not worth producing, since there are a lot more collected headers out there than there are true dual systems for our cars. :/

 

I think you are not understanding.

A true dual system is a good idea

A collected system is a good idea

Trying to make a true dual system have an x-pipe like a v-8 car is a bad idea. the x-pipe has to do with the uneven pulses in a v-8 engine you would not have in a rotary. So, really, you have two choices: collected or uncollected.

 

It wouldn'tbe a true X-pipe, but if you had a long primary into a collected header, which then split into a dual exhaust, it would look similar.

 

wait, huh? aren't the pulses at different times than each other? exhaust pulse from one rotor housing, then a pulse from the other, rinse, repeat? i thought the x-pipe would help pull an exhaust pulse from one housing "pulling" the other one along, until the pulse actually hits the x, then it goes across the median like it should

and yes, i know there is collected and uncollected, but an x-pipe wouldn't make any sense for a collected system, and that's what i was trying to say

 

a collector would do exactly what you just mentioned. No need for a true x-pipe.

 

ooooh, ok...but you're saying that an h/x-pipe would work for piston engines because the pulses are so uneven?

 

I've never dealt with a piston engine so I can't comment on how they'd work.

My "x-pipe" is just a long primary collector with a y-pipe not too far away from it. I don't think that's a true piston x-pipe though.