Hello Board. I would like to inform you that in the coming two weeks I have an engineering firm produce a custom 4" Exhaust System for my FD3S. The firm has provided me with photos of an exhaust system that was designed for an EVO using 3" Stainless Steel + V-bans. The construction look to be first class and I thought I would share my experience. This will be my 3rd and final attempt so I'm go for 4" system. Here are some photos of the EVO's exhaust. I will ask them to make a jig so that if anyone want to go this route. Please let me know what you guy think.











Here are some photos of my current FD exhaust

 

damn nice cant wait to see the final product

 

the picks of it on the car does not look like a 3rd gen

 

+1

Still awesome though!

 

those pics are of an evo, he stated that.

for such a well designed product i find it odd they couldnt prevent the tip from hitting the bumper, thats relatively easy to fix from an "engineering" standpoint.

kevin.

 

looks awsome..

 

I had A-Spec make me up something similar over a year ago, it uses diesel-style flex sleeves and slip couplers....be prepared for a lot of noise

 

hello noise.

rotaries make, uh, alot more noise than an evo.

you will love it for five minutes.

 

I ended up going with an Apex'i GT spec for the rear section (which UPS dented because they're incompetent idiots), and ordered one of the Active Tailpipe Silencers (which I'm still waiting on).

 

the pic with the tip hitting the bumper is his current setup

 

Haha, open dump on an evo is quiter than a 3" exhaust on an rx-7...

 

So it's bigger. Does that necessarily mean it's better? I'd have to see before and after dyno results versus a 3 in. system to be convinced there's any significant difference. The dynamics of exhaust flow can be tricky.

 

People dont do it for more HP but for quicker spool of the turbo...

 

Let me know when this is done and if they can use Borla xr1's instead of magnaflow...

 

if you put in the silincer you will lost lots of HP, i know i did, your better off with another resonator that is bigger in width and length

 

Preping For Exhaust

 

PREPING FOR EXHAUST WORK TO START THIS WEEK.

 

^ Those oil coolers are huge and the "front mount" is tiny. Do you plan on road racing this?

 

Thanks for the reading my post. The front mount looks tiny, but it is very misleading. The front mount cools like there is no tomarro. The change in termerature from the hot side to the cold side is night and day, The core is made up of 3 individual spearco tube and fin cores. The core is 9" thick, and no problem with heat soak. I be chilling.

 

Pressure differential. Its going to make a world of difference.

 

I knew it was going to be one of those strange deep cores. I forget who did the testing but they concluded that any core longer than 18" doesn't yield much more heat exchange. They also found that cores thicker than 3.5" was the same story. I'm not sure if they figured any figures with multiple cores but I'm sure that will make a difference.

Also, in reference to the "jig" to be made. Every turbo kit is going to need to have a different downpipe route. Unless you're going to market these for the factory twins I see easy fitment issues.

 

I would be so interested in ordering this 4" exhaust unless someone can tell me which manufacture makes one this big. Just to clear things up, its 3" from turbo to muffler, the muffler tip is 4" yes?

 

Looks insane...

 

NO, 4 inches from the turbo back.

 

nice work, esp on the heat shielding.