the 3" dp from racing beat only works with the RB REV TII turbo back exhaust. The only dp that will work is either the 2.5" RB dp with the presilencer or the 2.5" bonez dp from rx7.com

 

so i would need some sort of flanges to connect the 3" cat to the 2.5" dp?

 

Its not going to fit unless you weld a reducer from a 3" to 2.5" and a 2.5" flange on both ends, because the Apexi N1 duals are 2.5" at the inlet of the Y pipe.
If I were you, I would have dump the cat and got a presilencer and 2.5" dp from RB.

 

I use to have the racing beat cat-back and ditched it for the dual n1's. To me the apexis give it more of a aggressive look, and it sounds amazing. The racing beats were more of a higher pitched exhaust, the apexi's are more of a deeper pitch. Just my .02

 

borla duals or fail

 

I've got apexi n1 single exhaust. I've ran Bonez catless, Bonez Hiflo cat, and I am currently running RB headers with a cat welded in. The bonez pipes were louder, but had a really deep tone. The RB headers, even with the cat sounds similar, but it's at a much higher octave. I think you'll be happy with the Bonez and Apexi setup. I was thinking about switching to dual n1's, but after looking at some of the pics, my single n1 tip doesn't come out as far. I prefer not to have my exhaust tips stick out that much. I like how the modified dual n1's look, they sit just about the same as the single n1.

 

I am running an RB downpipe, RB silencer, Apexi N1 EVO passenger exit single exhaust. It isn't that loud at all.

I can put up a video this weekend if necessary.

 

Oh, one more thing. My tip of the muffler doesn't protrude as much as the others shown in this thread. Not by half, and it sits up nice and tight to the bumper. Interesting. Are some of these systems 'N1 style' or true Apexi N1?

 

Mine is a true N1 and fits nice and tight to the bumper also.



Don't know if you can tell, but that's the best shot I've got of the exhaust right now.

 

hey would u lose horse power if u only use one N1 exhaust?

 

my exhaust are real Apexi dual N1's. i had my clutch replaced and the guy that did the job did not put them back in the right place. i have just been too lazy to put them back. i happen to like how far the exhaust protrudes it prevents my bumper from turning black. i have seen pics of cars at shows in cali and the look really close to mine. just wondreing if any one with this set up has had clearence issues??

 

no

 

My Apexi N1 IS only 'one'. They don't only make duals.

 

my shop told me to get the 3" rb dp because its better for turbo. im probably gonna have them connect the 3" dp to the 3" bonez cat and they said theyre gonna cut a part of the cat or weld it to the 2.5" apexi y pipe. they said they would take care of it for me. a friend of mine said because im going from 3" to 2.5", that i would lose power....

 

Don't have them weld the pipes together. Have them weld in a reducer and use flanges! Otherwise you'll have one long exhuast pipe and if you ever change your mind in the future, you'll have to hack it up.

 

thanks, ill let them know. will i lose power though since the dp and cat is 3" and its going into a 2.5" y pipe?

 

Not that much. Most of your power loss is coming from the cat. Ideally you want to have 3" all the way with nothing inbetween including a y-pipe, resonators, and cats. However, technology these days have compensated for such things.

 

A single exhaust normally gains some power and noise, while a dual reduces some power and noise. It depends on the particular situation though.

Mine are Apexi brand N1 mufflers. The differences in length are probably due to people like me who have the mufflers mounted on a custom pipe rather than the pre-made Apexi catback.

Yes they do make duals. The FD dual looks like the link below, while the FC dual is separated like the stock dual mufflers.
http://www.apexi-usa.com/product_exh...=180&pageNum=1

 

So if you use a 3" DP, 3" midpipe and the N1 dual catback you should get as much power as the RB exhaust due to the boost increase but because it's straight through (as opposed to the RB kit ) you'll get more noise.

If you go with the RB DP you might not need the midpipe because the RB DP is LONG.

 

I didn't know that the dual exhuast would be better than a single. Good to know.

 

The Apexi advertisement is very misleading. If you want to try a reality check, search the internet for rotary-powered race cars (real race cars that win the big races, not show cars or drift cars), and see how many of them have dual exhaust.
http://www.evil-photographer.com/cars/Mazda/DG3/DG3.htm
http://www.teamspencer.com/2005/
http://www.improvedtouring.com/images/ITS/
http://www.starmazda.com/
http://mrec.rotary.net.nz/millen/millen.htm

 

i had talked to a few people and they all said for a pure flow a single exit exhaust with the straightest possible piping is the best was to make HP. i went with the dual N1's cause well they look f'n sick!!! and they are loud!! if you want performance go single if you want style go dual!!! just my$.02

 

I am aware they make duals, I was just saying that because I think the OP was confused as to whether he had to get duals, or a single.

 

Evil: but the racing cars want to save as much weight as possible so they compromise and go with the single exhaust. A lot of racecars also go with full FG bodies but it doesn't mean the stock bodies hinder performance.

 

I always thought that a single free flowing pipe would be much better than a Y-pipe. I don't know; in my opinion, a Y-pipe wouldn't make flow any better, even if it does add more volume. A single will be the same diameter and then go open air, while a dual will go one diameter, then broken down into two diameters (added together yeilds more volume), then open air.