from what i hurd from some guy on the street with a 7 he said that dual exhuast takes away horse power. and a single exhuast is better. is that true i dont really think it would take away horse power but i dunno

 

No. And it's "heard", not "hurd".

 

thats what i thought.

 

a true dual adds more top end power over single. if your looking to do this you need the racing beat road race headers. i read on here it adds about 40-50 horsepower but who knows for sure.

 

This isn't really true.

Exhaust tuning is quite complicated and greatly depends on the rest of the engine. The RB true dual system is great, but that's not to say it is the be all and end all of exhaust systems. And certainly, it is wrong to say that a true dual adds more top end over a single.

 

oh hell no its not the be all, end all. i would much rather convert to a single then the true dual anyday but of course thats my opinion. you are 100% right about everything you said, i was just giving some input in what i read and thought was true.

 

My FC has dual exhausts. I think most FCs have dual exhausts. I prefer the look of dual exhausts.

On the other hand, FDs tend to have single exhausts. I never knew why until I looked underneath a 3rd Gen last week at 7StockNorth. The gas tank only has room on one side for a muffler. So if you want dual exhausts on an FD, you'll have to modify the gas tank first.

But I don't think it matters if you have two pipes or one, as long as it moves the proper amount of air.

 

fcs do have dual exhausts but its not a true dual exhaust, its a y pipe where a true dual is two seperate pipes from the headers back.

 

I would do a single exhaust conversion for the weight savings, if your running NA on stock ports you are going to need some back pressure left in the system so you dont lose what low end torque you have.

 

well i decided to go eith the dual exuast but ya. i plane to rebuild the motor here pretty soon

 

The reason Mazda used a dual exhaust was to maintain the flow while keeping the noise under control. Consequently, most single exhausts are stupid loud or flow worse then an equivalent dual exhaust.

Also, with the extra cutout in the bumper, it looks like the car has lost a muffler.

 

yup i got two n1 mufflers slant tip with there titiam burnt

 

i prefer to go single but im still running my 7 stock besides the intake.

 

what type of intake you have on there? i have a cold air coming for mine its for a 90-93 ford escourt but i think its going to work. post some pics of your intake so i can get an idea

 

if you go to my profile and look in the album theres a picture of my engine, its not the same filter i have on there now but its really similar, the picture is from a few months ago

 

Does anyone have a exhaust for sale. 88 non turbo.

 

are you sure about that? With the FC exhaust not being a true dual I would say mazda did it for esthetics more then anything. Having the Y pipe introduces more bends into the system hampering flow. Im sure that if you ran a single stock size pipe with an OEM muffler (and precats ect) there would be almost no noise difference abut you would gain a little more flow then a fully stock dual system.

 

Yes, I'm sure. See the RX-7 books by Yamaguchi.

The Y pipe is not a restriction at all.

A single stock sized pipe? That's like less then 2". It would be a massive choke point.

 

on an NA engine, you might want to consider exhaust with exhaust scavenging, or anti reversion design built in to it.

this basically means that the exhaust is tuned to where the previous pulse of exhaust has the momentum to kind of "pull" the currently fired exhaust out the engine, GREATLY increasing top end without sacrificing bottom end.

this sort of thing is designed into the header and midpipe. cat back you cant really do that stuff.

"most" long tube headers have this factored in. but make sure you read up on the brand to see if they are legit in their claims.

on turbos though, it doesnt really matter...bigger is better. 3 inch or go home you know