Flowmaster® 817854 - Outlaw™ 409 SS Cat-Back Exhaust System with Split Rear/Side Exit

I got my 2018 Tundra 345ci or (5.7l) V8 with its single standard stock setup which is a 4:2:1. Sounded about as loud as a Prius. So I ordered the TRD dual muffler kit with 2, 27" glasspacks loaded with fiberglass noise canceling packing...always get a 2021 or older if you actually want a V8 plus the beauty of the Tundra is they are true dueled from factory, however, they tie a Y pipe in to make it a single out. The TRD system was barely any different than stock except for a slight more rumble on startup. After 2 years I said screw it and went with a Flowmaster outlaw cat back angled exits out behind rear wheels, for towing in mind. THAT is how a 5.7l V8 Tundra should sound baby! 2.5" on the mid pipes going into a dual in dual out flowmaster super 10 with dual 3" pipes running out. However, I feel they went a little large on the rear pipes. 3" each is a total of 6" piping. So I noticed a little torque loss. However, the sound is 100 percent worth it. What I lost in tourqe I gained in HP. Also running a TRD CAI. I think Flowmaster should redesign the catback kit to follow stock piping a little better. They should have had 2 1/4 on both mid pipes and ran a max of 2 1/2 out the rears however I would have ran 2 1/4 thru and thru. Noticable back pressure loss. With that being said, I am very happy with the Flowmaster super 10 dual in 2.5 dual out 3"! Makes the truck sound like it looks. Aggressive. Not recommended for children or wives as when you get on it, the entire interior rattles and vibrates if you dont feather the pedal. It's a beast at WOT. True Racing Muffler. Much better than ANY other Tundra setup I have heard. Better than Cravens, better than widow makers, equivalent approximately to cherry bomb extreeme. Have not heard powersticks yet so I can't compare.

I have had this exhaust installed for about a month, whatever coasting they used has already started coming off and now rust is starting to show, terrible quality, please save your money and buy something else!

Easy install! Sounds great! Runs great! Would definitely recommend!

If you've been searching through all kinds of exhaust options that won't break the bank and reading millions of reviews to find the perfect ones like i did, your search ends here. I went American Muscle to local mechanics to get opinions and examples until I found these. They're definitely loud, no disputes about that. But they're not like an average Honda driver where it sounds horrible and is just extremely loud. They have a great muscle car tone, and for the price you can't really get a lot better. You could pay am extra 1 or 2 hundred for Borla or roush and have the same sound if you wanted. They aren't so loud you'll be hated by the town if you care about that but they will definitely hear you coming. When you're not activley accelerating or flooring it they really aren't very loud or make a ton of noise at all for that matter, which is perfect for what I wanted. The second you step on it even a little bit though the car really comes to life. Really make it sound like a true muscle car. They may not be a cat back exhaust overhaul and you won't get that for only 450, but they definitely come close. Reving past 3.5 rpms gets pops consistently and so does driving. Great investment into your Mustang. If you want more vids or anything about my exhuast or other mods I've done my instagram is alani_gt

The sound is amazing and throaty, it isn't very loud when you don't want it to be which is nice for phone calls and such. But when you hit it sounds amazing, but don't expect it to be as loud as the product video because it doesn't sound like that, it is a bit toned down but is great and I love the dual black tips. Just buy it, you won't be disappointed.

My neighbors hate me at 5am every mornin! Sometimes I start my truck just so I can hear the noise it makes!!!

It is a really nice system and it made Charger sound like an absolute beast.

Love it! Rumbles like a beast!

Great and loud.

Pain in the a*s to install. Make sure you get your active valves correct. One will spin a different direction then the other, but still are spinning in the open to close position. Mine was hard to get not to leak. Had to weld the X pipe to the cat pipes. Note that the active exhaust valves are faulty on this product, they are making super bad noise. Flowmaster knows about it and replacing the product. Should come by the end of 4/2018. So do not buy this product until the end of 4/2018 until they fix the active exhaust valves.