[undy]

Originally Posted by Rare Iron

Bullets are VERY LOUD! They flow well, but are only good for 2-4 dBA's. The packing Dynomax uses in them is Owens Corning CRF fiberglass, & it is not very dense or absorbtive.

Undy is running chambered Powerstick sidepipe inserts, because his sidepipes are 4" Lake-type pipes & he needed something to slip inside. I could not build a packed muffler that would fit inside of the 4" sidepipes & still maintain a 3" flowpath - that was vital to him - to not lose HP. THESE ARE LOUD, but they sound awesome! (He knew that going in).

As far as turning them to run INTO the louvers (against the grain), this is my recommended flow for all chambered & max noise control Cobrapack applications. They will flow in either direction, but the Cobrapacks are about 4 dBA louder if you turn them around. The louvers are tiny, & they do create some drag vs. smooth perforations, but they still flow very well. The 3" internal versions flow VERY well, & the flowpath size is the important thing when limited to few options on this type of exhaust configuration. Most, if not all "stock" Cobra kit exhaust mufflers have a smaller than 2" muffler flowpath. Talk about KILLING horsepower for noise sake! As far as putting a cone or some other plug into the flowpath - well there is a tradeoff. The perf cones don't do much at all from what I've heard & read, & other objects in the flowpath just impede flow.

Most of the feedback I get? Both my 2.5" & 3" versions are just as quiet or quieter than the small core mufflers they were running in the first place, & they produce a super deep note, which is also easier to tolerate than different tones. Best of both worlds.

Sorry for posting - it's a sin for a non-advertiser to chime-in, but I thought this would be helpful to some of you. Don't buy 'em - just use my information. Thank you.

Rare is entirely correct. I'm sorry if my "LOUD" response was taken by anyone as a complaint about the pipes, it wasn't intended as such. As stated, I knew they were going to be loud going into it but I wanted max flow. I'll rethink the cone thing too..

The earth shaking is just a side benifit..