by PhreakdOut » Mon Apr 04, 2005 7:38 pm
IMO The flowmaster sounds "tinny" or like a hollow metal can. The reality is that the Flowmaster muffler has a narrow range of effectiveness. (I can elaborate on this if you wish, but it's not the point here.)
Unless you have some absorptive material like glass wool, basalt fiber or roving fiberglass, the end result may sound like a coffee can. I'd wager your local dealer is suggesting the Flowmaster series 40, 50, Delta Flow or Hushpower. To my knowledge, Flowmaster does not have any absorptive material in their product.
In very general terms, you can break up exhaust acoustics in to high frequencies and low frequencies. The glass wool and muffler chamber volume helps dissapate the higher frequencies. The low "throaty" note you seek (less than 200Hz) remains unaffected by the fiberglass.
Low frequencies must be removed by mechanical means. (Hemholtz tuners, cancellation of like frequencies, branch tuners, etc...) These are expensive features found in the original equipment muffler and not in "straight through" mufflers like the TRD or Greddy.
My recommendation is to just check around and see who offers the cheapest stainless steel straight through glass filled muffler in the area of 18" long. The less muffler internal volume, the louder it will be.
I'd say you can get a good muffler shop to build a custom stainless muffler for less than the TRD part. On the positive side, you get to choose your own tip style.
Have fun and keep us posted on how it's going.
-- The Phreak
'04 350Z 6spd Touring Roadster w/Nav | Megan Racing | Greddy | Nissan Motorsports | Whiteline | Wicked Tuning | Giovanna | Injen | Polished Intake & Throttle Body | Eibach | Central 20 | Stillen | Misc CF Items