Question: 1964 through 1968 Off Road Exhaust Assembly - Regular production Option (RPON11)

[2010corvette]

Have two questions?

Was the original supplier to St Louis "Arvin" for these exhaust systems and was a horse power increase ever shown when equipped from the assembly plant?
Example 2014 Corvette Stingray with RPONPP 460HP without RPONPP 455HP.
My 1967 Corvette was built early September 1966 and had RPON11 the cost back in the day was $36.90.
Today's RPONPP is $1195.00.

:thanks:

 

[JohnZ]

Have two questions?

Was the original supplier to St Louis "Arvin" for these exhaust systems and was a horse power increase ever shown when equipped from the assembly plant?

The standard under-car exhaust system was made by Walker, and Arvin supplied the RPO N-11 under-car "off-road" exhaust system. St. Louis had no way to measure horsepower (no chassis dyno at the plant), and no difference is quoted in the Engineering Specs or in the AMA Specs.