I'm finally getting around to posting these photos of the dual exhaust system we built for my car. Bare in mind this is for track use only and is not street legal because the catalytic converters are removed and exhaust noise exceeds most state regulations of 95db.

Total fabrication, installation and parts were $600. The system consists of 2.5" ID pipe, two 12" Dynomax "Bullet" mufflers, two 18" Dynomax "A" glasspacks, two 20 degree turn down tail pipes, 4 modified 02 sensor housings.

The way we designed the system to keep the sound levels below the mandated track limits of 97db is install the two duramax mufflers after the turndown from the engine.


Then we installed the glasspacks at the tailpipe.


The entire system is straight thru without baffles per se, keeping a good clean exhaust flow.


We reinstalled the 02 sensors with spacers that keeps the tip of the sensor further back from the direct gasses, in hopes of tricking it into thinking the catalytic converters are still in the system.


Woody: this exhaust system and 02 sensor modification was done AFTER the dyno, so I don't know if it will affect the FA ratio I had on the previous dyno...

 

They look nice and I am really wanting to listen to them. But dang, for $600 I would have just bought Borla. I am sure you get a lot more sound from this (if that is what you are looking for).

 

LOL... No offense, you must be new to the forum... I just pulled off a magnaflow system to replace it with this custom dual racing exhaust... Borla is a cat back kit that is 2-1-2 with the stock pipe sizes... It's not about sound, it's about HP for the track... This does not equate to your street car.

 

Oh, yes you are right. Sorry, I am still learning a lot about the car. Looks good man. Let me know what it does after the Dyno.

 

I'm just wondering, is there no H-pipe or X-pipe in your system?
Usually they are added to help equalize the system and add hp, most systems have them for those reasons anyway.

 

Good question, I did a ton of research on this too and could not find a single example of hp increases on a 6 cyl engine from the addition of an H or X pipe. I think it's one of those hypothetical "sales" gimmicks.

If you can show me a dyno proving different, I will concede.

 

Looking good Derek, can't wait to hear a sound clip. I bet you saved a lot of weight too.

It will be interesting to see what the 02 sensors are reading when you get back on the dyno. I think the best solution, since you have no cats now anyway, would probably be to try and find a way to ditch them altogether and just run open loop.

 

I had considered it, there are some widgets that claim to bypass the circuit. But of course none for the crossfire.

I'll try to post a sound clip, but as you know, I really can't drive the car on the street. Perhaps under the cover of darkness, I can make a quick run down the highway.

 

Very nice job. Glad to finally see the pics of the system. You definitely paid less then I did. For $600 I would have been ecstatic. Keep up the good work.

 

do you have a source or supply house and a part no for the mufflers? that's not stainless pipe is it? that's a very nice job.

 

Here's a link to my wholesaler http://www.racerpartswholesale.com/. The mufflers and glass packs are listed under Dynomax racing mufflers. Bare in mind, these are not street legal.

PS: It's not stainless, just new pipe. Morris Muffler specializes in race cars and do really good work.

 

Hi HDDP,

Just wondering if you have a sound clip of your car.

 

hecti....he is still around, but this thread is 7 yrs old. Horsepower and exhaust has been discussed many times on here. Check out some the newer threads.

 

HDDP has left the building, he has not posted in 2.5 years.