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Chevy C4 Corvette LT4 Cat Back Exhaust System (Oval Tips) #FCOR-0060

Product Details

Chevy C4 Corvette LT4 Cat Back Exhaust System (Oval Tips) #FCOR-0060

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.

  • 4 1/2″ Quad Rolled OVAL Tips.
  • 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…

 WARNING: This product in the physical form it is sold does not present a hazard. However, operations including, but not limited to welding, brazing, or thermal cutting can expose you to chemicals including Chromium, Nickel, Cobalt, Arsenic, Cadmium and Lead which are known to the State Of California to cause cancer, birth defects and other reproductive harm. For more information go to www.P65Warnings.ca.gov

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

Download PDF here… FCOR0060


With proper installation, your new Billy Boat Exhaust system will last a lifetime. While installation of this product is very simple and straight forward, there are a couple areas that need some attention.

  1. It helps to do this installation on a lift if you want to get the factory mufflers out in one piece.
  2. Unbolt the flange and loosen the clamp that holds the front of the system.
  3. Remove the factory nuts from the rear of the mufflers and set aside. Loosen the brackets that hold the rear of the mufflers and let hang in place. Remove the bolts that hold the center section of the system. Save the bolts as they will be reused. (NOTE: If the vehicle is a convertible, the center x-frame will have to be removed to remove and install the exhaust system).
  4. Remove the existing system.
  5. To install the Billy Boat Exhaust system align the driver’s side and passenger side front pipes and loosely tighten the supplied clamp and the reused flange bolts and nuts and reinstall the existing hanger bolts.
  6. Slide the center section onto the front pipes and loosely tighten the supplied clamps. Slide the drivers side and passenger side rear pipes onto the center section and loosely tighten the supplied clamps. Reinstall the existing hanger bolts.
  7. Position the new mufflers into place by inserting the mounting bolt at the rear of the muffler into the factory hanger. Mate the extension pipe and muffler inlet with the supplied clamp and just tighten them enough to still allow for movement while aligning the system. *But do not tighten them completely. Install the existing nut onto the mounting bolt at the rear of the muffler.
  8. With all components in place, use a straight edge along the bottom of the tips for proper alignment. Keeping in mind that it will take some time to align them correctly.
  9. Then start by tightening the flange and clamp in the front of the system first and then the clamps connecting the muffler sections making sure everything is still in alignment. Finish by tightening the existing brackets and the existing nuts at the rear of the mufflers.
  10. Fire the car up and take it for a spin around the block making sure there are no rattles.
  11. After logging on a few hundred miles re-torque your work.

Thanks again for choosing Billy Boat Exhaust.

Billy Boat Exhaust Safety, Installation and Liability Statements

SAFETY: Appropriate disassembly, assembly methods and procedures are essential to ensure the personal safety of the individual performing the kit installation. Improper installation due to the failure to correctly follow these instructions could cause personal injury or death. Read each step of the installation manual carefully before starting the installation.

  • Always wear safety glasses for eye protection.
  • Place the ignition switch in the OFF position.
  • Always apply the parking brake when working on the vehicle.
  • Block the front and rear tire surfaces to prevent unexpected vehicle movement.
  • Operate the engine only in well-ventilated areas to avoid exposure to carbon monoxide.
  • Do not smoke or use flammable items near or around the fuel system.
  • Use chemicals and cleaners only in well-ventilated areas.
  • Batteries can produce explosive hydrogen gas which can cause personal injury. Do not allow flames, sparks or flammable sources to come near the battery.
  • Keep hands and any other objects away from the radiator fan blades.
  • Keep yourself and your clothing away from moving parts when the engine is running.
  • Do not wear loose clothing or jewelry that can be caught in rotating or moving parts.

VEHICLE SUPPORT WARNING: Should the purchaser decide to install this exhaust product at home, be warned that car or light duty truck/van “bumper” jacks are intended for emergency use only. The use of frame contact jack stands in conjunction with a floor jack as main support is highly recommended to minimize accidental dropping of a vehicle while the installation proceeds. We recommend the use of a shop hoist if possible. Please use caution!

GENERAL STATEMENT OF LIABILITY: While we provide information for do-it-yourself installation of exhaust systems and related items, these operations are not without risk. Injury may occur during an installation or exhaust systems and their components may be damaged in the process. We are not responsible or liable for damages that may be sustained to persons or property during an installation. For this reason, we recommend professional installation as the best option when at all possible. While care has been taken in the preparation of the information contained in this web site, Billy Boat Exhaust and BillyBoatExhaust.com does not and cannot guarantee its accuracy. Anyone accessing this information does so at their own risk. It will be assumed that access indemnifies Billy Boat Exhaust and BillyBoatExhaust.com from any and all injury or damage arising from such use.

LOCAL LAWS & LIMITATION OF LIABILITY/DISCLAIMERS: Local Laws & Limitation of Liability/Disclaimers: The regulation of emissions production, noise levels and safety standards is undertaken by the federal government, each of the fifty state legislatures, and by many local municipalities, towns and counties. The manufacturer makes no warranties of merchantability, of fitness for a particular purpose, or that its products are approved for general use, or that its products comply with laws, regulations or ordinances in the states where they may be sold to the ultimate purchaser, the consumer. The entire risk as to the conformity of this product in any such state and as to repair, should the product prove to be defective or non-conforming, is on the retail purchaser, the buyer, the ultimate consumer of such product and it is not upon the seller, distributor, or manufacturer. In this connection, retail purchaser, the buyer, the ultimate consumer assumes the burden of the entire cost of any and all necessary service, alterations, and or repair. The foregoing statement limits the liability of the manufacturer.

If you have any questions please feel free to give us a call. Our direct line to the sales departments is 1-888-228-7435, ext 18. We are in Phoenix, AZ and can be reached 8am-5pm. Should you have questions that images would help explain, please email Mike at mike@bbexhaust.com.

*Please note, we do not follow daylight savings time if you are contacting us outside of Arizona.

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.

More information in additional browser tab.

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