I have a decent relationship with a guy in the Toyota Dealership Service Department where I bought my truck. He recommended that I should just go with a MagnaFlow Muffler and use the existing exhaust system on the truck. He said the cost for the muffler for the truck would be $80ish, and another 30 or so for the install at a muffler shop. Two questions for you guys out there smarter then I: 1.) Will just replacing the muffler give me the same approximate gains that a whole cat back system would, and 2.) What Magnaflow muffler would you guys recommend? I'm looking for any type of insight you all can provide. Thanks in advance.

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Slate Metalic, 5.7 L V8, SR5 DC w/ 6.5' Bed & TRD - MODS - Steelcraft Stainless Steel Nerf Bars, Carriage Works Polished Aluminum Billet Grill, Line-X Xtra Spray-In Bedliner, Toyota Underseat Cargo Storage Tray, FormulaOne Driver & Passenger Sides Window Tinting

Ask him where he can get the muffler for $80 and installed for $30. The muffler price is about right for online pricing, but no shop around here would install it for $30. Cheapest I found was $75 for basic install. $75 won't break the bank, but $30 would be a lot cheaper.

You don't get a lot of gains from the exhaust. You get more from the headers and then some from intake, and a little from exhaust. The stock piping varies in size all the way through. Not sure why they did that. You can gain a little by having the cat back since the piping should be standard all the way through. But again, you don't gain much from exhaust, it's mostly for the sound.

As for which Magnaflow to get, I'm not sure since I didn't look into them too much after hearing about a few reporting drone from the ones that most have installed.

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2007 SR5 Crewmax 5.7L 4x4
Mods: nerf bars, Truxedo tonneau, radar detector power, fog lights, black billet grille, rear differential breather, parking sensors, Line-X, power tailgate lock, hood safety latch mod, one off driving lights behind grille, Pioneer NAV w/ OEM camera, Flowmaster 50 SUV dual/dual, blue LED dash lights, Volant CAI
All mod descriptions and pictures © 2007,2008 by Toxarch. They may be copied only for personal use and the mods may be done for non-profit only.

I agree with Tox pretty much. The exhaust systems on modern trucks are designed to move the Torque and Horsepower down the RPM range where it's more usable for towing and hauling. As soon as you increase the diameter of the exhaust and the intake you will increase Horsepower and torque but unfortunately any gains will be higher up the RPM scale. Great for racing but bad for towing.

This is where programmers come into play because with a programmer you can alter the timing and fuel delivery to compensate for this change and move the HP and torque up and down the RPM range.

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Please Click for Sarah's Wish

I only paid 100 bucks for my flowmaster super 40 series and install. I just had the muffler changed out with duel inlet, duel outlet dumps. Probably why mine was so cheap

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Salsa Red Single Cab with 5.7
Devino 22s
5% Tint
Flowmaster Super 40 Series
Pioneer 6 disc changer flush screen
Alpine 6x9s in doors
Cadance 12
Cadance 1000 watt mono block amp
Shorty Blillet Antenna
Billet Grille with Bumper Inserts
Completely De-Baged TRD
Streetglow multicolor underbody neons
Painted to match engine cover
Line of Fire
HID Headlight Converstion

I used a magnaflow Y pipe and reversed it to use an 18" round magnaflow and it just wasn't loud enough for me so I had it straight piped and it sounds great now, but magnaflow does have a dual in/ single out that worked great for the Titans, again not very loud but i went from a staight pipe to that particular muffler on my Titan and the bottom end was a lot stronger.
http://www.toyotatundraforum.com/exh...installed.html
http://www.toyotatundraforum.com/exh...ision-1-a.html

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07 Silver Tundra DC 5.7L-Custom Exhaust-Limo Tint
Headlight Mod(Black)-Blacked out Emblems-24" Boss 330s

I'm not so into loud as I am a nice deep sound. The service manager claimed that with the magnaflow, it was possible to pick up a little hp and torque, but also claimed that I would get .5 to 1 more mpg.

Im not sure about magnaflow, but I know with my flowmaster its really deep