They have and I have seen it, but a couple of points to consider;
1) OP is looking upgrade from his un optimized perrin tbe to this new 4'' setup. and considering he's running a recirculated o2, I think he will see some gains.
2) Tough to compare STM to this one, as the weight difference is great.
3) He's also looking to optimize his setup by maintaining the same power at lower psi, I think its smart. will see if this works out for him. Assuming spark will remain the same.

One think I am cautious of is the use of Al for the downpipe, since the egt's are probably highest at the exit of the hotside, i wonder how much heat will al dissipate into the engine bay. I have seen Megan/ebay manifolds glow red on the dyno's and they are steal. I assume the al tubing is used probably thinner, hence the potential big weight saving. I believe FFP posted a pic off thier dyno few yrs back with a megan glowing red.

Technically speaking, the egt's should only start dropping once the gases exit the cylinders, unless there is post cylinder ignition occurring. This will cause more expansion to occure, but other than that and beside the turbulances energy, I think the number of bends ur exhaust contains, ID sizing, and amount of carbon build up u have will all play a role in the restriction. I think u will see good gains especially with ur setup having the dump tube recirculated and flowing much more than the average setup.

 

1. What does the STM car weigh?

2. Did you notice that the downpipe is actually made out of 304 stainless?

 

Not 100% sure on the Ricer's weight, but I wouldnt doubt if its around 2600lbs dry. They are pretty good at putting evos on a diet.
and I stand corrected, missed the 304 ss (not sure how!)

 

Yeah, that's pretty light, if you are correct. At that weight it doesn't surprise me at all that they went that fast. You saw what my notchback mustang weighed and how fast it went at only 670hp.

 

I'm a fan of the 4". I'm doing a 3.5" ti exhaust on mine. . ETS ftw!

 

Watch out, R/TErnie! Evodan2004 gonna be settin' you str8 in just few

 

Didn't hear back from you Gordian on my question...

Maybe you figured out we weren't talking about running 7s and 8s in the 1/8 mile

 

Ha. The only drawback from doing a larger exhaust is ground/diff clearance...and weight.

But if you make it out of Titanium or Aluminum... you've just negated one of the two things

I'd recommend using Titanium, but Aluminum sure is cheap!

 

gonna be finish-welding everything in a little while. Snapped a few more pics. Got the new tip on the car. Its about an 1.5inches longer than the first one and fits better as you can see in the pic below. Also, notice the hangers we used - not welded directly to the pipes. Instead they use band clamps to hold the exhaust system in place. Of course, I'm sure someone will find something wrong with these clamps because they're not normal....LOL!!!

 

I've always liked the idea of a 4" DP. While it may not make much, if any, power for most Evos over a 3" exhaust, it can only help spoolup. I really wish someone would do some back-to-back testing between a 3"DP into a 3" exhaust and a 4"DP into a 3" exhaust to see if there is a noticeable difference in spool. Even if it was just 100 RPM, I'd be all over it.

Just out of curiosity, why not go with a larger diameter dump pipe? If the goal is to get performance as close to a straight dump as possible, then looking at your setup, I'd guess the biggest restriction will be the WG dump pipe.

l8r)

 

We finished welding the exhaust last night. Also decided to redo the charge-piping in aluminum as well. Here's a few more pics.

BTW, we ended up weighing the aluminum piping and the Perrin exhaust taken off the car. We used a simple household scale you would use to weigh yourself. Stand on the scale to get your weight, then hold each piece individually and subtract the difference...

Rudimentary, but it works.

Total weight difference? 54lbs.

Not the 75-100lbs that I thought we might see, but still not bad especially considering the performance increase I'm hoping to see. BTW, the car sounds badazz with this exhaust on it! Deep and throaty and you can really hear the big Kelfords doing their thing.

 

Give it a Back to Back dyno test !

 

I will soon. Car was dynoed last year with 3inch and will be dynoed this year with 4inch. That's back to back testing right there

 

You're super cocky, but you have a nice setup lol

 

Your exhaust setup looks great.

Sounds like a lot of people on here have a bad case of the Jels, with their smaller but heavier exhaust.

Get some HQ vids up if you can.