Look for a small mom and pop shop. The chain places will rip you off royally. Also, the small shops thrive on word of mouth so they will IMO do a better job to keep your business and have you spread the word. Don't get me wrong, don't go to a total dive, make sure they have an adequate shop.
As for the stock piping. I'm not 100% sure but the stock is either 2.25" or 2" (2.25 seems about right) I purchased a 2.5" muffler and they had to make a reducer for it to fit to stock piping.
Oh and as for mufflers. I have the Flowmaster Original 40 because I like to hear my exhaust. No complaints from it whatsoever. The Original 40 will be a bit noisey with dual outs (I had that setup on my old truck and I loved it but you could definitely hear it). The Delta 40 will be quieter. If I were going for a quieter sound then I would probably go with the Magnaflow 18" muffler. It is quieter than the Flowmaster and IMO the flow through design gives slightly better performance than the chambered design of the Flowmaster. Both are more free flowing than that stock monster though.
My 2 cents =1 peso :-)
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The New - - 2007 Sun Fusion FJ Cruiser
Deep Cycle Battery-Running Boards-That's It For Now But Not For Long
The Old - - 2005 Tacoma TRD Off-Road (I Miss My Baby)
Dual Optima Batteries-Toytec Lift-MB Motoring Wheels-285/75/16 Nitto Grapplers-Waeco Portable Fridge/Freezer-Yakima Roof Rack-Softopper Canvas Top-Airaid Intake Kit-Billet Grille-Flowmaster 40-Aries Nerf Bars-Tint-Wade Hood Protector-TRD Seat Covers-Bed Extender-Toyota Bed Mat & TRD Floor Mats-XBar Light Bar
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