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Chevy C4 Corvette LT4 Fusion Axle Back Exhaust System (Oval Tips) #FCOR-0061

Product Details

Chevy C4 Corvette LT4 Fusion Axle Back Exhaust System (Oval Tips) #FCOR-0061

Billy Boat Exhaust sets the pace for stainless steel exhaust systems, especially when it comes to Corvette exhaust systems. All of our Corvette exhaust systems are built by hand using T304 stainless steel. Through extensive dyno testing we concluded that the LT motors love to breathe, so we designed the entire system using 3″ mandrel bent tubing. With a uniquely designed resonator and muffler pair, your L Tl, L T4, and ZR 1 motor will increase in performance and sound.

Fusion Exhaust Systems

The Fusion is a bi-modal exhaust system, meaning it has two passages, or modes, that the exhaust can travel through the muffler. Each of the mufflers has two outlets, with one side having a butterfly type valve which allows the exhaust flow to be shut off, regulating which side of the muffler the flows exhaust One side of the muffler is the “quiet” side, and one side is the ‘loud” side. The “quiet” side is a smaller, muffled and chambered tube, while the ‘loud” side is 3″ tubing straight through.

  • 4 1/2″ Quad Rolled OVAL.
  • Mandrel bent from the highest-grade T-304 stainless steel.
  • Designed, tested, and manufactured to the finest hand-made integrity found in any exhaust system.
  • Limited Lifetime Warranty

Have more questions? Contact us!

The Magnuson-Moss Warranty Act makes it illegal for companies to void your warranty or deny coverage under the warranty simply because you used an aftermarket part. READ MORE…

How a Dyno Works

We’re going to quote DynoJet directly to explain how the machine works, since paraphrasing would only do you an injustice. “Power, in mechanical terms, is the ability to accomplish a specified amount of work in a given amount of time. By definition, one horsepower is equal to applying a 550-pound force through a distance of one foot in one second. In everyday terms, it would take one HP to raise a 550-pound weight up one foot in one second. So to measure horsepower, we need to know force (in pounds) and velocity (in feet per second). DynoJet’s inertia dynamometer measures power just in this way. The dyno calculates velocity by measuring the time it takes to rotate the heavy steel drum one turn. The dyno measures force at the surface of the drum by indirectly measuring the drum’s acceleration. Acceleration is simply the difference in velocity at the surface of the drum from one revolution to the next. The force applied to the drum is calculated from acceleration using Newton’s 2nd law, F=MA, (F)orce equals (M)ass times (A)cceleration. Power is coupled to the drum by friction developed between the driving tire of the vehicle and the knurled steel surface on the drum of the dynamometer.”

Calculating Torque

“When an object rotates around a point, the object’s speed of rotation depends on both an applied force and the moment arm. The moment arm is the distance from the point of rotation to where the force is being applied. Torque is the product of the force and the moment arm. For example, think about trying to spin a drum by wrapping a rope around the drum and then pulling on the rope. If the rope is wrapped around a drum of one-foot radius and pulled with 550 pounds of force, the resulting torque is 550 foot-pounds. The torque on the dyno’s drum can be calculated by multiplying the force applied by the drum’s radius. However, engine torque is not equal to the dyno’s drum torque because the gearing through the drivetrain changes the moment arm. The change in the moment arm is proportional to the ratio of engine speed to drum speed. Therefore, tachometer readings are necessary to calculate and display engine torque.”

RPM Stock Horsepower BBE Horsepower Gains
2500 131 139 +8
3000 156 164 +8
3500 184 193 +9
4000 212 223 +11
4500 239 251 +12
5000 260 271 +11
5500 273 285 +12
6000 274 282 +8
RPM Stock Torque BBE Torque Gains
2500 277 291 +14
3000 274 287 +13
3500 276 290 +14
4000 278 292 +14
4500 279 292 +13
5000 273 284 +11
5500 261 272 +11
6000 240 247 +7

We try to put as much information as possible within our product pages to help with application choice and the installation process. The business you purchased our product from can be a wealth of information, but should you need additional help and information, please feel free to call or our sales department.

Monday-Friday 8:30am-5:00pm Arizona time.
888-228-7435 x18 or 623-581-7600 x18

*Note that Arizona does not follow Daylight Savings Time.

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