What is the performance difference between the stock Corvette manifolds, #160, and the CNC Modified Manifolds, #162S?
The performance gain with the port opened to 1.480″ x 1.480″ from the stock size of 1.260″ x 1.320″ is 5 to 9 horsepower. The stock size of 1.260″ x 1.320″ is actually much smaller than most exhaust port openings on heads, especially the World Products and Dart heads. This smaller stock size will severely block the exhaust port openings. 3. I can’t fit the 2 into 1 exhaust system on my car the way it is shown in your catalog. What is the next best way to run the system. The “over the top” design of the 2 into 1 system is the easiest to install and a good way to keep the system from contact with the trailer and the race track. While over the top installation is generally easier, running the exhaust pipes under the car will produce the same increase in horsepower as long as the pipes are connected into one of our collectors. When building your system remember to keep the primary pipes as short as possible. Our systems are designed around individual 90 and 45 degree bends, which are 12″ l
