I've been looking around for something that can flow nicley and looks good. It needs to be at leat 3.5inch and no bottlenecks. I'd perfer titanium but the only one i found above 3inch id the FEED for $2k.

I looked at the Apex GT but it seems from this picture that it has a severe bottleneck so its not a true 3.74 inch diameter???
https://www.rx7club.com/attachment.p...chmentid=50492

I also saw a Border-racing exhaust in one or two threads on here but could find no more info ANYwhere, anyone?

TIA

 

RP/Greddy race exhaust: http://www.rx7.com/store/rx7/fdexhaust.html

It's not titanium, but the entire exhaust (center section back) only weighs 36 pounds. Nice deep tone. My car dyno'd 362 RWHP at 12 PSI (single) with this.

Gene

 

HI I have a 3.5" all the way from single turbo to end, I modify the turbo V-band outlet for 3.5" pipe plus two Magnaflows 3.5" all the way thru works good sounds nice. Im starting on a 4" system for a customers FD, single turbo. but I have to have the vehicle in house. RON

 

Why not go with the 4 inch HKS racing Ti? Only the canister is titanium, but the piping is stainless steel. Still good though.

 

Why exactly do you think you need an exhaust diameter larger than 3"? Many people have been running high powered cars with 3" exhaust for years without a problem.

 

Agreed! 3" is fine for stock turbos.

 

HI with turbochargers the highest effeicency would be expand the exhaust gases as quickly possible after they leave the turbine exducer wheel, hence large pipe, or no pipe. but it might be loud, so they invented exhaust systems.

 

To a degree, do a search. Sometimes velocity is more important then no backpressure.

 

Not to mention torque.

 

Here is my Border Racing Burnout (type I)for sale
Here is their website Border-Racing Japan Website

The fact that the main 90 φ tail 115 φ catalyst is removed was produced to prerequisite, it is the muffler of high power direction. It has produced after the genuine front pipe with stainless steel pipe of everything 90 φ. You exchange with the front pipe for this corporation make FD3S simultaneously when, from, it is possible effectively to do exhaust. * In order to remove the catalyst, there are times when engine adjustment becomes necessary. (The instruction manual of attachment please do engine adjustment in reference.) * The photograph, the front pipe becomes the difference sale.

 

This one looks nice but it is made to bolt up to a 3in dp. I could cut off the 3in part and have it welded up but id hate to cut it up in case i didnt lik it it would be harder to sell.

Mahjik: I know i will need larger than a 3in b/c the car will start off with no less than 400rwhp. If and when i decide to to make more power i dont want to have to do it over. I understand your concern though.

 

Hey, what are you doing to it, what's done to it? Is it gonna be streetable?

 

Hi Gene,

what are the sound levels like? I may have to talk to Ari about that sucker.

 

It will be a LSx based motor and will be driven on a daily basis

<--*ducks and covers head*

 

/me takes out sniper rifle..

 

And?

The RX7.com street class drag car put down more power with a 3" exhaust.

 

didnt know that. got a link that explains more?

 

RX7.com doesn't appear to have their drag car info up anymore. I do know the catback they were using was the Greddy Power Extreme (as they sold me mine).

 

i see says the blind man..

What size exhuast were they running before they switched to a 3 inch? how much additional power did they gain?

Thanks!

 

Switched? I don't know that the car was ever built using a different exhaust.

 

oh sorry. i was under the impression they had a larder diameter exhuast then down sized. thanks for update.

 

wouldnt the fact that you have a 3 inch downpipe. mean that the apexi gt spec's megaphone piping going from 3 inch to 3.75 inch be okay then. assuming your midpipe is 3inch also otherwise wouldnt it just be dumb to have a big sudden gap in the piping diameter. sorry if i read your post wrong..its late and i am tired.

 

yeah the gt spec is 3.74 the whole way. It has three different size flanges (75,85,95) so that it will line up to a 3" exhaust or a 2.5 etc.... I can't think of many 3.74 downpipes so thats why they do that.

 

Pretty sure that the 3 incher doesnt become a restriction until at least 550-600 rhwp.

(that's what she said )

 

ok, but what doesnt make sense is with a 3.74 inch pipe and a 75mm flange, how can it fit flush to a 75 mm dp. (Not that the car is even having one but for explainations sakes.)
The flanged exhaust would need a coupler to to make a transition in size, therefore the pipe can't be 3.75 all the way...right?