Exhaust help?

[Vegas07TC]

I had a flowmaster muffler laying around from my previous car and it sounded good on it. So I decided to have it installed on my 07 TC. I had the resonator removed and I HATE the sound. It's raspy and it sounds like I have a tin can back there. I plan on getting a HKS or Tanabe. Which would you prefer and will I have to put the resonator back on? Thanks for your help.

[CadenceScion]

The rasp is coming from not having the resonator. Flowmaster mufflers are really nice, but they don't have enough sound absorbing material to help cut down the sound. I would upgrade to a Magnaflow, TRD or Tanabe Medallion Series Muffler. I would also pick up either a Magnaflow Resonator or a Moroso Spiral Flow Resonator.

[navylife59]

Cadence is dead on. It won't matter which performance muffler you use, it is going to sound raspy without the resonator. A true glass-pack muffler should work w/o the rasp but can't guaranty that it will sound any better by itself.

[CadenceScion]

The only down fall of fiber filled resonators and mufflers is the fiberglass packing will eventually deteriorate/break down. I ordered the Moroso Spiral Flow Resonator on 4/12/2011 from Summit Racing Equipment for $54.95 and it just arrived today.

2-1/2 Inlet 2-1/2 Outlet. Part # MOR-94050

[navylife59]

True, but they are cheap to replace and they will usually last a couple of years w/o problem. It would have to be setup as a bolt in for that reason so that fabrication cost would need to be factored in. If I ever get a shop, a lift, and a mandrel bender (have a TIG already), I have some exhaust designs that I wan't to build and research. One idea is very radical. I am having trouble finding all of the mathematical equations needed to compute the design with. There is Boyles Law, Fluid Dynamics, and Helmholtz resonance that I have to deal with as well.