Dynomax 17748 Super Turbo Muffler

These muffler sound perfect, nice deep tone rumble at idle . They sound great when you punch it with out the drone when Cruising . Highly recommend for big block applications.

I already installed the K&N 57-1514-1 Fuel Injection Performance Kit Gen2 Air Intake Kit on my 2005 TJ Wrangler, which added about 15-20% MPG to what I already had, and improved response and power. I want looking for a way to increase the savings, but I had a small budget, and didn't want something that would bother the neighbors at night. Best of both worlds here...with some slight differences and notes to mention.This isn't the cheapest muffler, or the highest flowing in it's rice range. It's given me a little more sound from the 4.0L I6 engine, not extremely deep or throaty, but that's due to the tailpipe itself not being modified. Please note that on the Wranglers, you need to make sure the transmission is supported if you attempt to remove the skid plate to access this area. The skid plate holds it in place and it will cause severe damage and a big headache if you don't support it (I found out about this through a Jeep forum before purchasing or attempting the install).This muffler sounds a little better, but does have a mild sound with some minor droning. The minor droning is the only reason this doesn't have a 5 star rating but it's close enough to consider it a 5 star for me I guess. That's only noticeable when driving at speeds below 30 MPH, and surprising not much of it at idle. The throttle and power are mildly improved over the stock setup, but a higher flow catalytic converter would make that jump more I believe.The biggest improvement is to the mileage. The mileage I get is as follows:Stock setup: 9.6-12.0 MPG City / 10.7-12.5 MPG Highway (hovering around 55-60MPH for efficiency)With K&N Intake installed: 12.2-14.9 MPG City (24% improvement)/ 13.5-15.3 MPG Highway (14% improvement)With Intake and Dynomax muffler: 13.9-16.1 MPG City (34% improvement over stock, 8% over Intake install) / 15.2-17.9 MPG Highway (43% improvement over stock, 17% increase over Intake install)Consider this, the Wrangler holds 19 gallons of fuel. This meant I could originally go at most (17 X 12.5 = 213) miles, but now have a maximum range of (17 X 17.9 = 304) miles. That's an additional 91 Miles highway driving (figure about 64-68 additional city miles). Compare to the mileage, so divide by MPG, and that's a fuel savings of 5.01 gallons Highway, and 4.09 gallons City. At about (we guess low cost for this) $3.25 per gallon, this is a savings of $16.28 Highway, and $13.29 each tank of gas, compared to how many gallons you would have originally spent to drive as far. The savings literally help pay for the product and install. I actually used this to save the money I would have spent on extra gas to save for additional items for maintenance after it had offset the cost of the items themselves.Do yourself a favor and install something like this on your vehicle, but make sure to research a little into your current specs so you are aware of how it changes the way your vehicle performs.

Great sound, minimal drone, beefy sound. Louder than factory and sounds better, but can still talk in the cab. Jeep Grand Cherokee Hemi

I have this on a Dodge van with a 318 v8 with a two into one pipe and even with both banks going in to one muffler it is almost too quiet. Perfect if you do miles but be prepared to be asked if you have a v6 it so quiet.

Thought I would be OK with this large of a turbo style, but this thing drones like it's proud of it. Even with a 19" resonator behind it. I'll be able to tame it down eventually. Bought from Amazon warehouse and had several splits on the rolled edge where someone apparently was beating on it with a hammer to get it off. I didn't see them until one of them cut my finger and earned a closer inspection. Didn't leak and I sealed the splits with a little weld to eliminate future problems. Me and Amazon need to inspect the warehouse items a bit more carefully.