1955-57 SCR Turbo or Flowmaster Dual Exhaust System With X-Pipe

SCR is the finest manufacturer of both original and custom exhaust systems for 55-72 Chevys. Classic Chevy has offered turbo and Flowmaster systems from SCR for years now. These systems include a forward crossover to equalize exhaust and increase horsepower while offering a better sound.

Taking exhaust one step further, our new SCR X-Pipe systems feature the latest design and technology. Borrowing from the C5 and C6 Corvette, these systems are completely bolt-in and require no welding and cutting like competitors' systems. All hardware and hangers are included so nothing else is needed to complete the installation in your home garage. The mufflers are relocated toward the rear of the car to reduce compartment noise and heat. A unique transverse rear hanger attaches to the frame to the rear muffler hanger mounting. These systems fit all cars except wagons, Nomads, and convertibles.

Parts List

• 57-172770-1 - 1955-57 Small Block Aluminized SCR "X" Turbo Performance 2-12" Dual Exhaust System For Use With 2-12 Rams Horn Exhaust
• 57-172787-1 - 1955-57 SCR "X" Quickflow Performance Dual 2-12" Exhaust System For Use With 2-12" Rams Horn Exhaust Manifolds
• 57-172779-1 - 1955-57 Small Block Aluminized SCR "X" Turbo Performance Dual 2-12" Exhaust System For Use With 2" Rams Horn Exhaust Manifold
• 57-172784-1 - 1955-57 Small Block Aluminized SCR "X" Quickflow Performance Dual 2-12" Exhaust System For Use With 2" Rams Horn Exhaust
• 57-172758-1 - 1955-57 Small Block Or Big Block Aluminized SCR "X" Turbo Performance Dual 2-12" Exhaust System For Use With Headers
• 57-172764-1 - 1955-57 Small Block Or Big Block Aluminized SCR "X" Quickflow Performance Dual 2-12" Exhaust System For Use With Header

Tools Needed

• Floor Jack and Jack Stands
• 12" Wrench
• 9/16" Wrench
• 3/8" Ratchet with 1/2" and 9/16" Sockets

Time Frame:

• 3 Hours

Image 1: The exhaust is designed to work with or without the transmission frame horns, and the X-pipes give room for automatic or manual transmissions and any type of rear transmission crossmember.

Image 2: This system is made of 2-1/2" mandrel bent and is available for use with 2" rams horn manifolds, 2-1/2" rams horn manifolds, or headers.

Image 3: Install the left and right exhaust, leaving the studs at the manifold loose for now. Notice how they are tucked up close to the engine to give room for any type of steering linkage.

Image 4: The X-system is held together with band clamps and not standard U-bolt type muffler clamps for a cleaner, leak-proof installation. The band clamps wrap entirely around the exhaust and give a seal. The band has a large and small end. The smaller end will fit the exhaust, and the larger end will fit the X-pipe. Slide the band clamp onto the exhaust with the smaller end facing forward toward the front of the car.

Image 5: Next, install the X-pipe. One end of the X-pipe is larger than the other end. The large end fits onto the two exhaust pipes. Slip it into place and leave the band clamps loose at this time. Be sure the X-pipe is above the emergency brake cables.

Image 6: The mufflers mount to the rear of the X-pipe. The mufflers have a center inlet and an offset outlet. Install the mufflers and band clamps, leaving the clamps loose.

Image 7: The outlets of the mufflers are offset to the outside of the car. The special transverse rear muffler hanger bolts to the back side of the two body mount brackets just in front of the rear end. The two muffler hangers bolt to the transverse hanger and drop down to the outlet of the mufflers. The hangers are held to the mufflers with the muffler to tailpipe U-bolt clamps.

Image 8: The inlet end of the tailpipes fits inside the outlets of the mufflers. To install the tailpipes, raise the car and place jack stands under the frame. Lower the car onto the jack stands, allowing the rear end to drop away from the body to give additional clearance to get the tailpipes up over the rear end housing.

Image 9: On the side of the frame on dual exhaust cars, there is a bracket for the rear brake hose bolted to the frame. This bracket must be removed. The original single exhaust system bracket that is welded to the frame must be used to retain the rear brake hose for the dual exhaust X-system.

Image 10: The rear tailpipe bracket bolts to the frame with a self-tapping 5/16" bolt just behind the spring shackle. The hangers are held to the tailpipes with standard U-bolt muffler clamps included in the kit.

Image 11: The large 2-1/2" tailpipes are routed so that they will work with the rear sway bar. Kits will be available for use with the rear spring kit (spare tire well deletion required). The standard kit includes tailpipes that exit the rear center below the bumper. Kits with '57-style corner exit tailpipes are available if you specify.

Image 12: With all the pipes and hangers installed, make final adjustments and tighten all the muffler clamps and band clamps after making sure the mufflers and tailpipes are level and well clear of the frame and underbody.

Image 13: With the new 2-1/2" exhaust system with X-pipe, your car will run better, sound better inside and out, and will now have a super-custom, modern look underneath!