Custom Exhaust

[23109VC]

what's the difference between 03-04 mufflers and the pre03 mufflers? why are they different sounding??

[blackbox]

I, like so many others here built my own exhaust system. I basically copied a stebro race setup, but i used aluminized 2" steel.

The sound is identical (to my ears) to all the stebro clips that I've heard. The sound is awesome. Of course I got the "drone", but I also got a faster throttle response (which I love). I haven't had a chance to dyno it yet because the only local shop with a dyno has computer software/hardware problems. Hopefully they will be up and running soon.

My understanding of the drone problem is pipe length (engine vibration causing the pipes to resonate at a particular frequency based on pipe length) and lack of acoustic baffling to combat the first problem.

Would a tip insert style baffle (like the harley guys use) do anything to help with the problem, or would it only lower the decibel level? It might just move the drone to a different rpm range.

I'm just thinking out loud I guess. I've only got $200 bucks in this project, but I would really like to keep it installed. any ideas?

[Cloudsurfer]

03-04 mufflers sound a bit deeper, and also have provisions for mounting different tips.

As to getting rid of the drone on your exhaust, I don't think you're going to get a drone-free exhaust by utilizing that type of design. For what it's worth, I have the dual muffler FabSpeed setup, and it sounds amazing and is drone free.

[23109VC]

i'm curious if the "maxspeed" system out there is essentially a knock off of the fabspeed system and is truly the same thing?

the sound clip video they have on their website / youtube sounds cool.

i also heard a sound clip in youtube of a base 2.7 wth a RUF exhaust and it wsa AMAZING sounding.. but I haven't seen anyone selling a RUF exhaust for our cars.

[ddb]

I've driven my 2.7 with the complete Maxspeed system now for 600 + miles. Honestly, I haven't thought about drone at all because it just isn't an issue. If there is some drone, it definitely isn't offensive. The description of the system from Maxpseed is accurate.

BTW, no CEL issues at all (knocking on wood)!

ddb

[blackbox]

I found out thru internet searching that Ford Mustangs encounter the exact same problems when using particular Magnaflow and Flowmaster cat-back systems. They also get resonance around 2krpm.

One mustang board member( http://forums.corral.net/forums/showthread.php?t=496793) solved his drone problem by adding a 1/4 wave closed-end resonator tube before his muffler. The closed end tube is reflecting the the sound wave back into the exhaust path out of phase, thus cancelling the resonance. Sounds simple enough, but I'm not sure I could apply it to my setup.

One of the board members also posted a link to an aftermarket BMW exhaust that incorporated the same style of resonator tube. Check out the link above. It was a pretty interesting read.

I've heard the Fabspeed and Maxspeed exhaust. They sound good, but not my taste. I like a less baffled sound.

[cnavarro]

Very interesting read. Packaging and weight are my two concerns with trying to integrate dual resonator tubes on our systems :-)